JEE Main Physics 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]
Answer: (D)
Solution
Deceleration a = F/m = 5000/1000 = 5 m/s². Time to stop: t = v/a = 30/5 = 6 s.