A car accelerates uniformly from 10 m per second to 30 m per second in 5 seconds. Its acceleration is
- 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.