Physicsmedium · Past Paper
A body of mass 5 kg is moving with a velocity of 2 m/s. If its velocity is increased to 4 m/s, the work done is:
A10 J
B20 J
C30 J
D40 J
✓ Correct Answer: C — 30 J
Work = 1/2 m(v2^2 - v1^2) = 1/2 * 5 * (16 - 4) = 1/2 * 5 * 12 = 30 J.
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