Physicshard · Past Paper
A stone of mass 5 kg is dropped from a height of 10 m. What is its kinetic energy just before hitting the ground? (g = 10 m/s^2)
A50 J
B500 J
C100 J
D250 J
✓ Correct Answer: B — 500 J
According to the conservation of energy, KE at the bottom = PE at the top = mgh = 5 * 10 * 10 = 500 J.
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