Question

12. A stone of mass 2.0 kg is allowed to fall
freely from the top of a cliff of height
60 m. What is the kinetic energy of the
stone when it just reaches the ground?
(Given that g = 10 m/s2)?​

Answer 1

Force acting on the stone : Gravity

Applying the Work-Energy Theorem,

$W_{all forces}$ = ΔKE

$mgh$ = ΔKE

2×10×60 = ΔKE

KE = 1200 J