A 0.5 kg ball is released from the top of a building of height 20 In. Find the kinetic energy of the ball, just before it hits the ground (assume g = 10 m/s²).

Correct option is B

The potential of 0.5 kg ball placed at the top of the building of height 20m.
= m × g × h
= 0.5 × 10 × 20 = 100 Joule.
From the law of conservation of energy,
The kinetic energy of given ball before it hits the ground = 100 Jule. = potential energy of ball