World-class sprinters can accelerate out of the starting blocks with

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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