A ball is dropped from a bridge of 122.5 metre above a river. After the ball has been falling for two seconds, a second ball is thrown straight down after it. Initial velocity of the second ball so that both hit the water at the same time is

(1) 49 m/s

(2) 55.5 m/s

(3) 26.1 m/s

(4) 9.8 m/s

A balloon starts from the ground from rest with an upward acceleration of 2 m/s². After 1 sec, a stone is dropped from it. The time taken by the stone to strike the ground is approximately:

1. 0.3 s

2. 0.7 s

3. 1 s

4. 1.4 s

A boy throws balls into the air at a regular interval of 2 seconds. The next ball is thrown when the velocity of the first ball is zero. How high do the ball rise above his hand? [Take g = 9.8 m/ s²]

(1) 4.9 m

(2) 9.8 m

(3) 19.6 m

(4) 29.4 m

A ball projected from the ground vertically upward is at the same height at time t₁ and t₂. The speed of projection of ball is [Neglect the effect of air resistance]

(1) $g\left[t_2-t_1\right]$

(2) $\frac{g\left[t_1+t_2\right]}{2}$

(3) $\frac{g\left[t_2-t_1\right]}{2}$

(4) $g\left[t_1+t_2\right]$

Two balls are projected upward simultaneously with speeds of 40 m/s and 60 m/s. Relative position (x) of the second ball with respect to the first ball at time t = 5 sec will be: [Neglect air resistance]

1. 20 m

2. 80 m

3. 100 m

4. 120 m

A ball is dropped from a height h above ground. Neglect the air resistance, its velocity (v) varies with its height y above the ground as

(1) $\sqrt{2g(h-y)}$

(2) $\sqrt{2gh}$

(3) $\sqrt{2gy}$

(4) $\sqrt{2g(h+y)}$

For a body moving with uniform acceleration along the straight line, the variation of its velocity (v) with position (x) is best represented by:

(1) 

(2) 

(3) 

(4) 

The position-time graph for a paricle moving along a straight line is shown in figure. The total distance travelled by it in time t=0 to t=10 s is 

(1) Zero

(2) 10 m

(3) 20 m

(4) 80 m

The position-time graph for a body moving along the straight line between O and A is shown in During its motion between O and A, how many times the body comes to rest?

(1) Zero

(2) 1 time

(3) 2 times

(4) 3 times

Which one of the following graph for a body moving along a straight line is possible?

(1) 

(2) 

(3) 

(4)