Doc Brown has calculated his Delorean can accelerate at a rate of 2.52 m/s/s. How far away must he and Marty stand to allow the car to

Question

Doc Brown has calculated his Delorean can accelerate at a rate of 2.52 m/s/s. How
far away must he and Marty stand to allow the car to accelerate from rest to a speed
of 39.2 m/s?

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Yến Oanh 4 years 2021-07-20T20:02:49+00:00 1 Answers 30 views 0

Answers ( )

  1. vankhanh
    0
    2021-07-20T20:04:27+00:00
    Reply

    Answer:

    The value  is  s = 306.6 \ m

    Explanation:

    From the question we are told that

       The  acceleration is a = 2.52 \ m/s

        The speed to attain is v = 39.2 \ m/s

    Generally the time taken is mathematically represented as

            t = \frac{v}{a}

    =>    t = \frac{39.2}{2.52}

    =>    t= 15.6 \ s

    Generally from the kinematic equation we have that

          s = ut + \frac{1}{2}at^2

    Here the initial  velocity is  zero i.e  u =  0 \  m/s (it started from rest)

    So

         s = 0* 15.6 + \frac{1}{2} * 2.52 * (15.6)^2

    =>  s = 306.6 \ m

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