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Math Help - Solve time and distance??

  1. #1
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    Solve time and distance??

    Hey There,
    An electric car starts from rest and accelerates at a rate of 2.0 m/s^2 in a straight line until it reaches a speed of 20 m/s. The car then slows at a constant rate of 1.0 m/s until it stops.

    a) how much time elapses from start to stop?
    b) how far does the vehicle travel from start to stop?

    So I have:
    Vo= 0 m.s
    a = 2.0 m.s.s
    V = 20 m/s
    a when it slows 1.0 m.s


    IS THIS CORRECT, PLEASE CHECK FOR ME
    Time for first half of run 10 s and 20 s for 2nd part. So total time start to stop is 30 s.

    Distance first half is 100 m and 200 m for 2nd part. SO Total distance is 300m.

    Do I have it correct??

    I found time for start to the 20 m.s and then 20m.s to stop.
    Same with time.
    Added them both.
    Let me know thanks.
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  2. #2
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    Quote Originally Posted by bradycat View Post
    Hey There,
    An electric car starts from rest and accelerates at a rate of 2.0 m/s^2 in a straight line until it reaches a speed of 20 m/s. The car then slows at a constant rate of 1.0 m/s until it stops.

    a) how much time elapses from start to stop?
    b) how far does the vehicle travel from start to stop?

    So I have:
    Vo= 0 m.s
    a = 2.0 m.s.s
    V = 20 m/s
    a when it slows 1.0 m.s


    IS THIS CORRECT, PLEASE CHECK FOR ME
    Time for first half of run 10 s and 20 s for 2nd part. So total time start to stop is 30 s.

    Distance first half is 100 m and 200 m for 2nd part. SO Total distance is 300m.

    Do I have it correct??

    I found time for start to the 20 m.s and then 20m.s to stop.
    Same with time.
    Added them both.
    Let me know thanks.
    correct.
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  3. #3
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    Ontario Canada
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    Thanks to let me know. Joanne
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