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Question 30447
JEE Physics · Hard

Work, Power and Energy: Energy — Block on Spring MCQ

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Energy — Block on SpringHardQuestion 30447

Question

A 1 kg block on a smooth surface is attached to a spring (k = 100 N/m). Initially compressed by 0.3 m and released. Maximum KE of the block is:
  1. A
    9 J
  2. B
    4.5 J
    Correct
  3. C
    3 J
  4. D
    1.5 J

Correct answer

4.5 J

Explanation

Maximum KE = initial spring PE = ½kx² = ½×100×0.09 = 4.5 J (at the natural length of the spring).

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