IB · A · multiple choice
Space, time and motion · Question 1
Space, time and motion · Original GioPhysics question with a detailed, mark-by-mark answer guide.
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multiple choice1 mark
A ball is launched from level ground at 20 m s⁻¹ at an angle of 30° above the horizontal. Air resistance is negligible. How long does the ball take to reach its maximum height?
- A
0.51 s
- B
1.0 s
- C
1.8 s
- D
2.0 s
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Answer overviewCorrect answer: B — 1.0 s
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 B: 1.0 s
- 2
C uses the horizontal component, 20 cos 30°, instead of the vertical one. D is the total time of flight rather than the time to the top.
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