A car travelling at a speed of 80 kmph is brought to a speed of 60 kmph within a distance of 30 m by applying brakes. On travelling further at a speed of 60 kmph, the driver of the car saw an overturned truck across and he applied the brakes again. The car stopped just close to the overturned vehicle. What was the distance (in kmph) between the overturned truck and the car when the driver first saw the overturned truck? The reaction time of the driver may be taken as 2 seconds.
A train travels 40 km at a uniform speed of 30 kmph. Its average speed after travelling another 40 km is 45 kmph for the whole journey. Its speed in the second half of the journey is
A bike decreases its speed from 60 kmph to 40 kmph in 5 seconds. Find the acceleration of the bus.