Question 5
Newton's Laws and MomentumA ball of mass 0.15 kg is kicked against a rigid vertical wall with a horizontal velocity of 50 m s−1. If it rebounced with a horizontal velocity of 30 m s−1, calculate the impulse of the ball on the wall.
- A.3.0 N s
- B.4.5 N s
- C.7.5 N s
- D.12.0 N s
Show the answer and explanation
Answer: D (12.0 N s)
Explanation
The velocity reverses, so the change is 50 − (−30) = 80 m s−1. Impulse = 0.15 × 80 = 12.0 N s.