A Level · AS · multiple choice
AS Level foundations · Question 3
AS Level foundations · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 1
- Topics
- 1
- Answer
- Complete
multiple choice1 mark
A ball of mass 0.20 kg strikes a wall at right angles with a speed of 8.0 m s⁻¹ and rebounds along the same line at 6.0 m s⁻¹. The ball is in contact with the wall for 0.050 s. What is the magnitude of the average force exerted on the ball?
- A
8.0 N
- B
24 N
- C
56 N
- D
112 N
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Answer overviewCorrect answer: C — 56 N
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is C: 56 N
- 2
A subtracts the speeds instead of recognising that the velocity has reversed, so the change in momentum is 0.20 × 14 and not 0.20 × 2. That one sign is the whole item, and it costs more marks across a real Paper 1 than any other single idea.
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