Question

An object placed at the height of 10 metres from the surface of earth has a gravitational potential energy of 2100 J. What is the mass of the object? Gravitational acceleration is 10 m/s2

Answer 1

Height $= 10\space m$

Potential Energy $=2100\space J$

Mass of body $= m$

$mgh=2100$

$m=\dfrac{2100}{10\times10}=21\space kg$