Answer: 0.5.
- A 0.5
- B 0.2
- C 1.0
- D 0.05
Correct answer: A. 0.5
Explanation: For no sliding, μg ≥ a → μ ≥ 5/10 = 0.5.
Free-body diagram of a block on an incline: weight (mg) resolves into mg sinθ along the slope and mg cosθ into the slope, balanced by the normal force N and friction f.
Concept context
Newton's three laws, friction, circular motion, and free body diagrams.