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27 March, 10:03

Claire starts driving with an initial velocity of 5.0 m/s towards north. She drives along a straight, level path with a uniform acceleration and travels 500. m in 20. seconds. A. What is the average velocity for the entire 20. seconds? B. What is the velocity at the end of 20. seconds?

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  1. 27 March, 10:07
    0
    S=ut+1/2at^2

    500m = (5m/s*20s) + 1/2 (a*20^2)

    500-100=1/2 (a*400)

    800=a*400

    a=800/400

    a=2m/s^2

    v=u+at

    v=5+2*20

    v=5+40

    v=45m/s
  2. 27 March, 10:24
    0
    A) avg velocity = (v+u) / t

    = (500/20 + 5) / 20

    =3/2m/s

    b) v=u + at

    =5 + (25-5) / 20 * 20

    =25m/s
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