Physics

A football player, starting from rest at the line of scrimmage, accelerates along a straight line for a time of 1.5 s. Then, during a negligible amount of time, he changes the magnitude of his acceleration to a value of 1.4 m/s2. With this acceleration, he continues in the same direction for another 1.2 s, until he reaches a speed of 3.4 m/s. What is the value of his acceleration (assumed to be constant) during the initial 1.5 s period?

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  1. Well,this is a math exercise more than physics.
    Compute the value of Vf at the end of each period, and use that as the Vi for the next period.
    First period:
    Vf=a*1.5
    Second Period
    Vf=a*1.5+1.4*1.2=3.4
    solve the last equation for a.

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    bobpursley
  2. Thanks, it really helped

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