A 2 kg ball is dropped from rest and falls 5 m to the ground. Assuming no air resistance, what is the kinetic energy of the ball just before it hits the ground? (g = 10 N/kg)

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Question

A 2 kg ball is dropped from rest and falls 5 m to the ground. Assuming no air resistance, what is the kinetic energy of the ball just before it hits the ground? (g = 10 N/kg)

Accepted Answer

C: 100 J — The gravitational potential energy lost equals the work done by gravity on the ball, which transfers entirely to kinetic energy (no air resistance). GPE = mgh = 2 × 10 × 5 = 100 J. Option B uses mass instead of weight multiplied by height. Option D incorrectly doubles the answer.

Answer

D: 200 J

Answer

A: 10 J

Answer

C: 100 J

Answer

B: 50 J

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