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Question 6024
NEET Physics · Hard

Work, Energy & Power: Work-Energy Theorem MCQ

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Work-Energy TheoremHardQuestion 6024

Question

Block (4 kg) starts from rest on rough incline (h = 5 m, μ = 0.2, θ = 30°, g = 10 m/s²). Speed at bottom:
  1. A
    8 m/s
  2. B
    √80 m/s
  3. C
    6 m/s
  4. D
    √60 m/s
    Correct

Correct answer

√60 m/s

Explanation

L = h/sin30° = 10 m. W_net = mgh − μmg cos30°·L = 200 − 40√3. v ≈ √60 m/s.

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