A car starts from rest and moves with a constant acceleration. During the 5th second of its motion, it covers a distance of 36 meters. What is the acceleration of the car?
Correct answer: B. 8 m/s2
- A. 12.5 m/s2
- B. 8 m/s2
- C. 15 m/s2
- D. 16 m/s2
- E. 14 m/s2
Explanation
Solution: S=vit+1/2 at2 36=(0)t+1/2 at2 36=1/2 at2 During 5th second: 36=1/2 a(5)2-1/2 a(4)2 36=1/2 a(25-16) 36=1/2 a(9) 36*2/9=a a=8ms-2
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