How can accelerate out of starting block within acceleration


Assignment:

World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude 15m/s2.

1) How much horizontal force F must a sprinter of mass 51kg exert on the starting blocks to produce this acceleration?

2) Which body exerts the force that propels the sprinter, the blocks or the sprinter?

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Physics: How can accelerate out of starting block within acceleration
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