Answer to Question #332569 in Mechanics | Relativity for Benge

Question

a diver of mass 80kg,steps off a diving board at point a 4,0 m above the level of the water of a swimming pool.the diver enters the water at point b and comes to rest at point c.while the diver falls through the air,an average frictional force of magnitude 172n acts on the diver. the total work done on the diver by no conservative forced while he moves from a to c is -6240j

Answer 1

$\eta=\frac{(mg+F)h}Q=0.62=62.3\%.$