Physicshard · Past Paper
If a body of mass m starts falling from point A at height h, what is its velocity at point B which is at height h/2?
Asqrt(gh)
Bsqrt(2gh)
Csqrt(gh/2)
D2sqrt(gh)
✓ Correct Answer: A — sqrt(gh)
Loss in PE = Gain in KE. mg(h - h/2) = 1/2 mv^2 => mgh/2 = 1/2 mv^2 => v = sqrt(gh).
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