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  1. #1
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    physics homework

    An experimental rocket car starting from rest reaches a speed of 560 km/h after a straight 400-m run on a level salt flat. Assuming that acceleration is constant, (a) what was the time of the run, and (b) what is the magnitude of the acceleration?
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  2. #2
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    Quote Originally Posted by twistedmexican View Post
    An experimental rocket car starting from rest reaches a speed of 560 km/h after a straight 400-m run on a level salt flat. Assuming that acceleration is constant, (a) what was the time of the run, and (b) what is the magnitude of the acceleration?
    Let's do b) first.

     v^2 = u^2 + 2as

     v = 155,5 m s^{-1}

     24197,5 = 0 + 2a(400)

     a = 30 m s^{-1}


    Now a)

     v = u + at
     155,5 = 0 + (30)t
     t = 5,18
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