physics help please?

Question

A 65.0 kg diver steps off a diving board and drops straight down into the water. The net force when in the water is an upward 1250 N. If the diver comes to rest 4.0 m below the water's surface, what is the total distance between the diving board and the diver's stopping point underwater?

Answer 1

the PE of the diver will be offset by the work of the force of bouyancy

65*9.81*(d+4)=1250*4
solve for d
d=3.84 m
so the total distance is
7.84 m

j