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Math Help - Using Formulae

  1. #1
    Junior Member FB FTW's Avatar
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    Using Formulae

    1. Use the forumula
    s=ut+1/2atSQUARED
    to find the value of s when:

    a) u=0, t=2, a=-10 (Answer -100?)
    b) u=10 t=5 a=10
    c) u=20 t=1/2 a=10
    d) u=-10 t=1/2 a=10
    e) u=2 t=1/4 a=-5

    There are others, but I think once I get this one i'll beable to do the others if you know what I mean!

    @Charlie
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  2. #2
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    1. Use the forumula
    s=ut+1/2atSQUARED
    to find the value of s when:

    a) u=0, t=2, a=-10 (Answer -100?)
    b) u=10 t=5 a=10
    c) u=20 t=1/2 a=10
    d) u=-10 t=1/2 a=10
    e) u=2 t=1/4 a=-5

    There are others, but I think once I get this one i'll beable to do the others if you know what I mean!

    @Charlie
    a)
     s= ut+\frac{1}{2}at^2
     s=0(2)+\frac{1}{2}(-10)(2)^2
     s=0+\frac{1}{2}(-10)(4)
     s=0+\frac{1}{2}(-40)
     s=0+(-20)
     s=-20

    Is that what you meant?
    Last edited by euclid2; December 14th 2008 at 06:36 AM.
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  3. #3
    Junior Member FB FTW's Avatar
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    Quote Originally Posted by euclid2 View Post
     s= \frac{ut+1}{2at^2}

    this formula?
    No s= ut+ 1/2(half)atSQUARED
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  4. #4
    Junior Member FB FTW's Avatar
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    Thats it.
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  5. #5
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    No s= ut+ 1/2(half)atSQUARED
    See my first post.
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  6. #6
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    1. Use the forumula
    s=ut+1/2atSQUARED
    to find the value of s when:

    a) u=0, t=2, a=-10 (Answer -100?)
    b) u=10 t=5 a=10
    c) u=20 t=1/2 a=10
    d) u=-10 t=1/2 a=10
    e) u=2 t=1/4 a=-5

    There are others, but I think once I get this one i'll beable to do the others if you know what I mean!

    @Charlie
    b)b)
     s=ut+\frac{1}{2}at^2
     s=(10)(5)+\frac{1}{2}(10)(5)^2
     s=50+\frac{1}{2}(10)(25)
     s=50+\frac{1}{2}(250)
     s=50+125
     s=175
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  7. #7
    Junior Member FB FTW's Avatar
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    Yeh thats it!
    I've thanked, but can you do the rest please?
    Thanks,
    Charlie
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  8. #8
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    1. Use the forumula
    s=ut+1/2atSQUARED
    to find the value of s when:

    a) u=0, t=2, a=-10 (Answer -100?)
    b) u=10 t=5 a=10
    c) u=20 t=1/2 a=10
    d) u=-10 t=1/2 a=10
    e) u=2 t=1/4 a=-5

    There are others, but I think once I get this one i'll beable to do the others if you know what I mean!

    @Charlie
    c)
    s=ut+\frac{1}{2}at^2
    s=(20)\frac{1}{2}+\frac{1}{2}(10)(1/2)^2
    s=10+\frac{1}{2}(10)(0.25)
    s=10+\frac{1}{2}(2.5)
    s=10+1.25
    s=11.25
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  9. #9
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    1. Use the forumula
    s=ut+1/2atSQUARED
    to find the value of s when:

    a) u=0, t=2, a=-10 (Answer -100?)
    b) u=10 t=5 a=10
    c) u=20 t=1/2 a=10
    d) u=-10 t=1/2 a=10
    e) u=2 t=1/4 a=-5

    There are others, but I think once I get this one i'll beable to do the others if you know what I mean!

    @Charlie
    d)

    s=ut+1/2at^2
    s=(-10)(1/2)+1/2(10)(1/2)^2
    s=-5+1/2(10)(0.25)
    s=-5+1/2(2.5)
    s=-5+1.25
    s=-3.75
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  10. #10
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    1. Use the forumula
    s=ut+1/2atSQUARED
    to find the value of s when:

    a) u=0, t=2, a=-10 (Answer -100?)
    b) u=10 t=5 a=10
    c) u=20 t=1/2 a=10
    d) u=-10 t=1/2 a=10
    e) u=2 t=1/4 a=-5

    There are others, but I think once I get this one i'll beable to do the others if you know what I mean!

    @Charlie
    e)
    s=ut+1/2at^2
    s=(2)(1/4)+1/2(-5)(1/4)^2
    s=1/2+1/2(-5)(0.0625)
    s=0.34375

    this one seems chaotic, but just plug and chug as they say
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  11. #11
    Junior Member FB FTW's Avatar
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    Thanks alot, can you do these aswell?

    3)
    Use the formula
    v=√u^2-2as
    To work out v
    (√ is root, and its all of it. Like the line at the top of root goes all the way to the end of formula)

    a) u=0, a=-10, s=5 (Is this one -52?)
    b) u=10 a=-10 s=5
    c) u=5 a=-2 s=10
    d) u=2 a=1/2 s=3
    e) u=1 a=1/2 s=2

    Thanks!
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  12. #12
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    Thanks alot, can you do these aswell?

    3)
    Use the formula
    v=√u^2-2as
    To work out v
    (√ is root, and its all of it. Like the line at the top of root goes all the way to the end of formula)

    a) u=0, a=-10, s=5 (Is this one -52?)
    b) u=10 a=-10 s=5
    c) u=5 a=-2 s=10
    d) u=2 a=1/2 s=3
    e) u=1 a=1/2 s=2

    Thanks!
    a)
    v=√u^2-2as
    v=√(0)(0)-2(-10)(5)
    v=√(20)(5)
    v=√100
    v=10

    Like that?, where all is under the squareroot sign?
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  13. #13
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    Thanks alot, can you do these aswell?

    3)
    Use the formula
    v=√u^2-2as
    To work out v
    (√ is root, and its all of it. Like the line at the top of root goes all the way to the end of formula)

    a) u=0, a=-10, s=5 (Is this one -52?)
    b) u=10 a=-10 s=5
    c) u=5 a=-2 s=10
    d) u=2 a=1/2 s=3
    e) u=1 a=1/2 s=2

    Thanks!
    b)
    v=√u^2-2as
    v=√(10)(10)-2(-10)(5)
    v=√100+20(5)
    v=√100+100
    v=√200
    v=14.14
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  14. #14
    Junior Member FB FTW's Avatar
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    Quote Originally Posted by euclid2 View Post
    a)
    v=√u^2-2as
    v=√(0)(0)-2(-10)(5)
    v=√(20)(5)
    v=√100
    v=10

    Like that?, where all is under the squareroot sign?

    http://i36.tinypic.com/2dhxits.png
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  15. #15
    Senior Member euclid2's Avatar
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    Quote Originally Posted by FB FTW View Post
    Thanks alot, can you do these aswell?

    3)
    Use the formula
    v=√u^2-2as
    To work out v
    (√ is root, and its all of it. Like the line at the top of root goes all the way to the end of formula)

    a) u=0, a=-10, s=5 (Is this one -52?)
    b) u=10 a=-10 s=5
    c) u=5 a=-2 s=10
    d) u=2 a=1/2 s=3
    e) u=1 a=1/2 s=2

    Thanks!
    c)
    v=√u^2-2as
    v=√(5)(5)-2(-2)(10)
    v=√25+4(10)
    v=√29+40
    v=√69
    v=8.30
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