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A rifle bullet loses 1/20th of its velocity in passing through a plank. What will be the least number of such planks required to just stop the bullet? | A rifle bullet loses 1/20th of its velocity in passing through a plank. What will be the least number of such planks required to just stop the bullet is..

A train travels between two stations a and b 135 km apart in 5 hours. if on the return journey the average speed is reduced by 2 km/hr, what is the average speed during the journey from a to b and b to a?

An athlete completes one round of a circular track of diameter 200m in 40s .what will be the distance covered and the displacement at the end 2 min 20s ?

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Robbers in a car travelling at 20 ms−1 pass a policeman on a motor cycle at rest. The policeman immediately starts chasing the robbers. The policeman accelerates at 3 ms−2 for 12 s and thereafter travels at a constant velocity. Calculate the distance covered by the policeman before he overtakes the car.