Question

World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude 15m/s2.A) How much horizontal force F must a sprinter of mass 61 kg exert on the starting blocks to produce this acceleration? B) Which body exerts the force that propels the sprinter, the blocks or the sprinter?

Answer 1

915N; the blocks;

Step-by-step explanation:

a) F = ma = 61 * 15 = 915N

b) the sprinter pushes against the block. it is the reaction force of the block on the sprinter that propels the sprinter. therefore the blocks are exerting the force that propels the sprinter.