Physicsmedium · Past Paper
A ball of mass 0.5 kg slows down from 10 m/s to 5 m/s. The work done on the ball is:
A-18.75 J
B18.75 J
C-25 J
D25 J
✓ Correct Answer: A — -18.75 J
Work = Change in KE = 1/2 m(v2^2 - v1^2) = 0.5 * 0.5 * (25 - 100) = 0.25 * -75 = -18.75 J.
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