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Work, Power and Energy: Spring — Compression MCQ

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Spring — CompressionMediumQuestion 30424

Question

A spring (k = 200 N/m) is compressed 0.1 m and releases a 0.5 kg block from rest on a frictionless surface. Speed of block when spring returns to natural length:
  1. A
    2 m/s
    Correct
  2. B
    4 m/s
  3. C
    0.2 m/s
  4. D
    √2 m/s

Correct answer

2 m/s

Explanation

½kx² = ½mv² → v = x√(k/m) = 0.1×√(200/0.5) = 0.1×20 = 2 m/s.

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