AP · AP 1 · multiple choice
AP Physics 1: Algebra-Based · Question 3
AP Physics 1: Algebra-Based · Original GioPhysics question with a detailed, mark-by-mark answer guide.
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multiple choice1 mark
A car traveling at speed v brakes to rest in a distance d. Assuming the same constant braking force, what distance is required to bring the same car to rest from a speed of 2v?
- A
d√2
- B
2d
- C
4d
- D
8d
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Answer overviewCorrect answer: C — 4d
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: 4d
- 2
B is the answer of a candidate reasoning proportionally without noticing that kinetic energy goes as v². The work–energy theorem gives Fd = ½mv², so d ∝ v².
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