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March 29, 2017

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An athlete is training and is required to perform shuttle runs. From the starting position they sprint out to 10m (this takes 2 seconds). I know that a = 5m/s/s but I need to know at what metre within the run would maximum acceleration occur. Appreciate your help.
thanks

  • Maths/Physics - ,

    for all we know the acceleration is constant. I actually suspect the force is greatest when pushing off the starting block and therefore acceleration is greatest at the start (F = m a), but there is nothing in your statement to help us with a versus t. Therefore assume a is constant.
    d = (1/2) a t^2
    10 = (1/2) a (2^2)
    20 = 4 a
    a = 5 m/s^2 indeed

  • Maths/Physics - ,

    I think I know what you are looking for, so starting off where Damon left off:


    Max acceleration occurs when the velocity=acceleration.

    Vi=0m/s^2
    Vf=5m/s and
    a=5m/s^2
    d=?

    Solve for d.

    Vf^2=Vi^2+2ad

    (5m/s)^2=0+2(5m/s^2)d

    25=10d
    25/10=d

    d=2.5m


    The sprinters will not keep accelerating indefinitely, so I think this what your teacher/professor had in mind. But a better question would be when will the velocity equal the acceleration.


    Best

    BTW, I answered this in your earlier post.

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