Answer: Perfectly inelastic collision.
- A Elastic collision in the majority of cases studied
- B Inelastic collision as widely reported
- C Perfectly inelastic collision
- D Explosive separation in standard practice
Correct answer: C. Perfectly inelastic collision
Explanation: When colliding objects stick together, it is a perfectly inelastic collision with maximum KE loss.
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.