Exercise 4.21 Censtanis Part A World-class sprinters can accelerate out of the s

Question

Exercise 4.21 Censtanis Part A World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude 15 m/s How much horizontal force must a sprinter of mass 61 kg exert on the starting blocks during a start to produce this acceleration? Express your answer using two significant figures. FA horisontal Submit Request Answer Part B Which body exerts the force that propels the sprinter, the blocks or the sprinter herself? The blocks The sprinter herself Submit t Ans Provide Feedback

Explanation / Answer

We have

F = m*a

= 61.0kg*15m/s^2 = 915N

This force is applied to the runner BY THE BLOCKS

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