Answer: 11.2 N·s.
- A 1.6 N·s
- B 8 N·s
- C 11.2 N·s
- D 6.4 N·s
Correct answer: C. 11.2 N·s
Explanation: Impulse = m x delta_v = 0.16 x (40 - (-30)) = 0.16 x 70 = 11.2 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.