A car accelerates uniformly from 10 m per second to 30 m per second in 5 seconds. Its acceleration is
Correct answer: B. 4 m per second squared
- A. 2 m per second squared
- B. 4 m per second squared
- C. 6 m per second squared
- D. 8 m per second squared
Explanation
Acceleration is the change in velocity divided by the time, so 20 divided by 5 gives 4 m per second squared. Dividing the final velocity by the time instead gives 6, a common slip. The distance covered in that time would be the average velocity of 20 multiplied by 5, that is 100 m.
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About Acceleration
Acceleration measures the rate at which velocity changes with time, including changes in speed, direction or both. Work includes average and instantaneous acceleration, the relation a = Δv/Δt, uniform acceleration equations, and interpreting velocity time and displacement time graphs, with acceleration carefully distinguished from velocity.
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