Answer: 3 N.
- A 3 N
- B 6 N
- C 1.5 N
- D 4.5 N
Correct answer: A. 3 N
Explanation: Acceleration = 6/3 = 2 m/s²; tension at midpoint pulls the far 1.5 kg: T = 1.5·2 = 3 N.
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.