## A body is released from the top of a tower of height H . After 2s it is stopped and then instantaneously released…..

Q. A body is released from the top of a tower of height H m. After 2s it is stopped and then instantaneously released. What will be its height after next 2s (in metres)?

(a) H-5

(b) H-10

(c) H-20

(d) H-40

Ans: (d)

## A body is thrown vertically upward from a point ‘A’ 125m above the ground. It goes up to a maximum height of 250 m above…..

Q. A body is thrown vertically upward from a point ‘A’ 125m above the ground. It goes up to a maximum height of 250 m above the ground and passes through ‘A’ on its downward journey. The velocity of the body when it is at a height of 70m above the ground is (g = 10 m/s2)

(a) 20 m/s

(b) 50 m/s

(c) 60 m/s

(d) 80 m/s

Ans:(b)

## A boy throws n balls per second at regular time intervals. When the first ball reaches the maximum height he throws …..

Q. A boy throws n balls per second at regular time intervals. When the first ball reaches the maximum height he throws the second one vertically up. The maximum height reached by each ball is

(a) $\displaystyle \frac{g}{2(n-1)^2}$

(b) $\displaystyle \frac{g}{2n^2}$

(c) $\displaystyle \frac{g}{n^2}$

(d) $\displaystyle \frac{g}{n}$

Ans: (b)

## 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)