Laws Of Motion Question 120
Question: A car having a mass of 1000 kg is moving at a speed of 30 metres/sec. Brakes are applied to bring the car to rest. If the frictional force between the tyres and the road surface is 5000 newtons, the car will come to rest in[MP PMT 1995]
Options:
A) 5 seconds
B) 10 seconds
C) 12 seconds
D) 6 seconds
Show Answer
Answer:
Correct Answer: D
Solution:
$ v=u-at\Rightarrow \ t=\frac{u}{a} $ [As $ v=0 $ ] $ t=\frac{u\times m}{F} $
$ =\frac{30\times 1000}{5000}=6\ \sec $
