WAEC Physics 2020 Objective — Question 30
Question 30 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.
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A motorcycle starting from rest, is uniformly accelerated such that its velocity in 10 s is 72 km/h. What is its acceleration?
- A. 10^8 ms^-2
- B. 86 ms^-2
- C. 4 ms^-2
- D. 2 ms^-2Correct
Explanation
Given u=0, t=10s, v=72km/hr=72x1000/3600=20m/s. Acceleration a=(v-u)/t=(20-0)/10=2 ms^-2.
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