Answer: 4 N·s.
- A 2 N·s
- B 4 N·s
- C 0 N·s
- D 8 N·s
Correct answer: B. 4 N·s
Explanation: Impulse = Δp = m(v − (−v)) = 0.2·20 = 4 N·s.
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.