Answer: 1000 N.
- A 100 N
- B 500 N
- C 1000 N
- D 2000 N
Correct answer: C. 1000 N
Explanation: F = m x delta_v / delta_t = 0.5 x 20 / 0.01 = 1000 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.