A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is (take g = 10ms-2)
A. 5 J
B. 10 J
C. 15 J
D. 20 J
Correct Answer: Option A
Explanation
Height h = 1/2 (U²/g) = 10²/20 = 5m
Energy before hitting ground is = P.E at the height of 5m.
P.E = mgh = 0.1 x 10 x 5 = 5 J
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