Question

A body of volume V and desnity `rho` is initially submerged in a non-viscous liquid of density `sigma (gt rho)`. If it is rises by itself through a height h in the liquid. Its kinetic energy will
A. increase by h V `(sigma-rho)g`
B. increase by hV`(rho+sigma)`g
C. increase by `(hVrhog)/(sigma)`
D. decrease be `(hVrhog)/(sigma)`

Answer 1

Correct Answer - A
Work done by all the force W=change in kinetic energy two forces are acting, weight and upthrust.
`therefore" "W=(sigma-rho)g(h/V)`