Equations of uniformly accelerated motion Quiz
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5 questions, one answer each
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1. A trolley starts from rest and accelerates uniformly at 2.0 m s⁻² for 5.0 s. What distance does it travel?
- A. 10 m
- B. 25 m
- C. 50 m
- D. 20 m
2. Which equation should be used to find the final speed of a car when the displacement, initial speed and acceleration are known but the time is not?
- A. v = u + at
- B. s = (u + v)t/2
- C. s = ut + ½at²
- D. v² = u² + 2as
3. A stone is dropped from rest and falls for 3.0 s. Taking g = 9.81 m s⁻², what is its speed after 3.0 s?
- A. 29 m s⁻¹
- B. 44 m s⁻¹
- C. 3.3 m s⁻¹
- D. 88 m s⁻¹
4. A car travelling at 30 m s⁻¹ decelerates uniformly at 5.0 m s⁻². What is its stopping distance?
- A. 180 m
- B. 3.0 m
- C. 90 m
- D. 6.0 m
5. A student uses v² = u² + 2as for a lift that accelerates, moves at constant speed, then decelerates, treating the whole journey as one stage. Why is this wrong?
- A. The lift has mass
- B. The equation is only valid for constant acceleration, which does not hold for the whole journey
- C. The equation only works for vertical motion
- D. The equation does not include time