A ball of relative density 0.8 falls into water from a height of 2 m. The depth to which the ball will sink is (neglect viscous forces)

Options

A. 8m
B. 2m
C. 6m
D. 4m

Answer

A

Explanation

Loss of gravitational potentiall energy = work done against Buyonancy
`mg(h+h')=Bh'" "impliesW(h+h')=Bh'`
`(h+h')=(B)/(W)h'" "implies h+h'=(1)/(0.8)h'implies h'=4h" "implies h'=8m`