Answer: 5 m/s2.
- A 4 m/s2
- B 5 m/s2
- C 8 m/s2
- D 10 m/s2
Correct answer: B. 5 m/s2
Explanation: Total mass = 3+5 = 8 kg. a = F/m = 40/8 = 5 m/s2.
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.