Physicsmedium · Past Paper
A ball is dropped from a building and reaches the ground in 3s. What is the height of the building? (g = 10 m/s^2)
A15 m
B30 m
C45 m
D90 m
✓ Correct Answer: C — 45 m
h = ut + 0.5gt^2 = 0 + 0.5 * 10 * 3^2 = 5 * 9 = 45m.
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