Question: 4 . 2 1 - World - class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has

4.21 -

World

-

class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude

15

/

2 .

How much horizontal force must a

55

kg sprinter exert on the sprinting blocks to produce this acceleration? Which object exerts the force that propels the sprinter; the blocks or the sprinter herself?

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