## A ball is projected vertically upwards with a velocity of 25 ms-1 from the bottom of a tower. A boy who is standing at the top…..

Q. A ball is projected vertically upwards with a velocity of 25 ms-1 from the bottom of a tower. A boy who is standing at the top of a tower is unable to catch the ball when it passes him in the upward direction. But the ball again reaches him after 3 sec when it is falling. Now the boy catches it Then the height of the tower is (g = 10 ms-2)

(a) 5 m

(b) 10 m

(c) 15 m

(d) 20 m

Ans: (d)

## A ball is dropped from the top of a building. The ball takes 0.5s to fall past the 3m length of a window at certain distance…..

Q. A ball is dropped from the top of a building. The ball takes 0.5s to fall past the 3m length of a window at certain distance from the top of the building. Speed of the ball as it crosses the top edge of the window is (g = 10 m/s2)

(a) 3.5 ms-1

(b) 8.5 ms-1

(c) 5 ms-1

(d) 12 ms-1

Ans: (a)

## A stone projected upwards with a velocity ‘u’ reaches two points ‘P’ and ‘Q’ separated by a distance ‘h’ with velocities u/2 and u/3…..

Q. A stone projected upwards with a velocity ‘u’ reaches two points ‘P’ and ‘Q’ separated by a distance ‘h’ with velocities u/2 and u/3. The maximum height reached by it is

(a) 9h/5

(b) 18h/5

(c) 36h/5

(d) 72h/5

Ans: (c)

## The splash of sound was heard 5.35s after dropping a stone into a well 122.5m deep. Velocity of sound in air is

Q. The splash of sound was heard 5.35s after dropping a stone into a well 122.5m deep. Velocity of sound in air is

(a) 350 cm/s

(b) 350 m/s

(c) 392 cm/s

(d) 0 cm/s

Ans: (b)

## A particle moving with uniform retardation covers distances 18m, 14m and 10m in successive seconds. It comes to rest…..

Q. A particle moving with uniform retardation covers distances 18m, 14m and 10m in successive seconds. It comes to rest after travelling a further distance of

(a) 50m

(b) 8m

(c) 12m

(d) 42m

Ans: (b)