Question Detail
Question
A stone of mass 0.5 kg is projected vertically upward with a velocity of 15 m/s. Calculate the kinetic energy of the stone on reaching the ground.
Correct Answer
Option D is the correct answer.
Detailed Explanation
When the stone returns to the ground, its speed will be the same as the initial speed (15 m/s) in the absence of air resistance. Kinetic energy = ½ mv² = ½ × 0.5 × (15)² = 0.25 × 225 = 56.25 J.
Hint
In the absence of air resistance, the speed on return equals the initial speed.