A car of mass 1200 kg initially at rest has been accelerated to a speed of 8 m/s in 16 meters. Average acceleration of the car is _ m/s2? And force is _ N?
Correct answer: D. 2 and 2400
- A. 1.5 and 1500
- B. 2.5 and 2400
- C. 3.5 and 3500
- D. 2 and 2400
Explanation
m=1200kg v=8m/s d=16m v2=u2+2as (8)2=(0)2+2(a)(16) 64=32a a=2m/s2 F = ma = 1200×2 =2400N
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