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Math Help - Please can you verify these answers?

  1. #1
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    Please can you verify these answers?

    Hi

    These following questins are for a maths asignment that I have, could someone please check my answers so that I can make sure Im correct, as I found this question slightly difficult:




    My answers:

    A) i)
    Acceleration= gradient= change in y/change in x
    5-2=3 =3x
    5u-3u=2u

    2u/3= 2/3u

    ii)
    3x3u= 9u
    0.5(5yx3)=7.5u

    9u+7.5u= 16.5u

    B)
    0.5(4x?)=20m
    0.5(4x10u)=20m

    u=10

    Part B is where I was the most unconfident on

    Thanks!
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  2. #2
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    Quote Originally Posted by fishkeeper View Post
    Hi

    These following questins are for a maths asignment that I have, could someone please check my answers so that I can make sure Im correct, as I found this question slightly difficult:




    My answers:

    A) i)
    Acceleration= gradient= change in y/change in x
    5-2=3 =3x
    5u-3u=2u

    2u/3= 2/3u

    ii)
    3x3u= 9u
    0.5(5yx3)=7.5u

    9u+7.5u= 16.5u

    B)
    0.5(4x?)=20m
    0.5(4x10u)=20m

    u=10

    Part B is where I was the most unconfident on

    Thanks!
    (a) part (i) is ok

    (ii) find the area of the trapezoid ... the area under a velocity curve represents the displacement.

    (b) sketch in the remaining velocity until the particle comes to rest at t = 9 ... you should get a triangle representing the velocity from t = 5 to t = 9. now use what I told you in part (ii) above to determine U
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  3. #3
    Junior Member
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    haha

    About 30 mins I did this but forgot about me posting here.

    I realised that my answer in a ii was completely wrong and have corrected that and drew the triangle and got u=2

    Im confident with doing this sort of question now, and pretty sure my answer is correct so I feel good about myself
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