Q

A block of mass 2 kg slides on a horizontal surface at 4 m/s and compresses a spring until it stops. The kinetic frictional force is 15 N and the spring constant is 10000 N/m. What is the compression of the spring?

RRB Group D 10/12/2018 / Shift-I 2018
✓ Answer: D 5.5 cm
Using energy conservation, (1/2)mv² = (1/2)kx² + 15x. Thus 16 = 5000x² + 15x, giving x ≈ 0.0551 m = 5.5 cm. The source calculation omits friction but selects the same approximate answer.
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