Question

A small block of wood of relative density $0.5$ is submerged in water at a depth of $5m$. When the block is released, it starts moving upwards, the acceleration of the block is: ($g=10m{s}^{-2}$)

• A. $5m{s}^{-2}$
• B. $10m{s}^{-2}$
• C. $7.5m{s}^{-2}$
• D. $15m{s}^{-2}$

Answer 1

The correct option is B $10m{s}^{-2}$

Total upward force$=(upward-downwardforce)=ma$
$v\times g\times 1000-500gy=500v\times a$
$500g=500a$
$a=g$
So,
$a=10m/s^2$