Using Formulae

**FB FTW** · December 14th 2008, 05:18 AM

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

**euclid2** · December 14th 2008, 05:23 AM

Originally Posted by FB FTW

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?

**FB FTW** · December 14th 2008, 05:28 AM

Originally Posted by euclid2

$s= \frac{ut+1}{2at^2}$

this formula?

No s= ut+ 1/2(half)atSQUARED

**FB FTW** · December 14th 2008, 05:36 AM

Thats it.

**euclid2** · December 14th 2008, 05:37 AM

Originally Posted by FB FTW

No s= ut+ 1/2(half)atSQUARED

See my first post.

**euclid2** · December 14th 2008, 05:42 AM

Originally Posted by FB FTW

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)
$s=ut+\frac{1}{2}at^2$
$s=(10)(5)+\frac{1}{2}(10)(5)^2$
$s=50+\frac{1}{2}(10)(25)$
$s=50+\frac{1}{2}(250)$
$s=50+125$
$s=175$

**FB FTW** · December 14th 2008, 05:45 AM

Yeh thats it!
I've thanked, but can you do the rest please?
Thanks,
Charlie

**euclid2** · December 14th 2008, 05:50 AM

Originally Posted by FB FTW

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)
$s=ut+\frac{1}{2}at^2$
$s=(20)\frac{1}{2}+\frac{1}{2}(10)(1/2)^2$
$s=10+\frac{1}{2}(10)(0.25)$
$s=10+\frac{1}{2}(2.5)$
$s=10+1.25$
$s=11.25$

**euclid2** · December 14th 2008, 05:54 AM

Originally Posted by FB FTW

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

**euclid2** · December 14th 2008, 05:59 AM

Originally Posted by FB FTW

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

**FB FTW** · December 14th 2008, 06:13 AM

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!

**euclid2** · December 14th 2008, 06:38 AM

Originally Posted by FB FTW

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?

**euclid2** · December 14th 2008, 06:42 AM

Originally Posted by FB FTW

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

**FB FTW** · December 14th 2008, 06:42 AM

Originally Posted by euclid2

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

**euclid2** · December 14th 2008, 06:43 AM

Originally Posted by FB FTW

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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