6.A body moving with uniform retardation covers 3 km before its speed is reduced to half its initial value. It comes to rest in another distance of

7.A stone is dropped from the top of the tower and reaches the ground in 3 s.Then the heigh of the tower is

8.Drops of water fall from the roof of a building 9 m high at regular intervals of time, the first drop reaching the ground at the same instant the fourth drop starts its fall. What are the distances of the second and third drops from the roof ?

9.A body covers 26 m, 28 m, 30 m, 32 m in 10th s, 11th s, 12 th s and 13 th s respectively.The body starts

10.A rifle bullet loses 1 / 20th of its velocity in passing through a plank. The least number of such planks required to just stop the bullet is