Answer: 25 N.
- A 10 N
- B 15 N
- C 20 N
- D 25 N
Correct answer: D. 25 N
Explanation: F = m x delta_v / delta_t = 5 x 10 / 2 = 25 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.