Throwing and Catching at Same Height

Q. A stone is dropped into water from a bridge 44.1 m above the water. Another stone is thrown vertically downward 1 sec later. Both strike the water simultaneously. What was the initial speed of the second stone

1. 
2. 
3. 
4. 

Q. A body A is projected upwards with a velocity of $98\frac{m}{s}$. The second body B is projected upwards with the same initial velocity but after 4 sec. Both the bodies will meet after

1. 6 sec
2. 8 sec
3. 10 sec
4. 12 sec

Q.

An object is projected upwards with a velocity of 100 m/s.The time after which it will strike the ground is (g = $10m{s}^{-2})$

1. 10 sec

2. 20 sec

3. 15 sec

4. 5 sec

Q.

A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is

1. Greater than the time of fall

2. Equal to the time of fall

3. Less than the time of fall

4. Twice the time of fall

Q.

A ball is shot vertically upward from the surface of another planet. A plot of 'y' versus 't' for the ball is shown in figure where y is the height of the ball above its starting point and t = 0 at the instant the ball is shot. The figure's vertical scaling is set by $y_s$ = 30.0 m. What are the magnitudes of (a) the free-fall acceleration on the planet and (b) the initial velocity of the ball?

1. a = - 8 m/s², u = + 20 m/s

2. a = 8 m/s², u = + 20 m/s

3. a = - g m/s², u = + 22.5 m/s

4. a = - 10/s², u = + 25 m/s

Q. A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is

1. Greater than the time of fall
2. Equal to the time of fall
3. Twice the time of fall
4. Less than the time of fall

Q. A body is projected up with a speed 'u' and the time taken by it is T to reach the maximum height H . Pick out the correct statement

1. It acquires velocity U/2 in T/2 sec
2. Its velocity is U/2 at H/2 sec
3. It reaches H/2 in T/2 sec
4. Same velocity at 2T

Q.

A ball is thrown up from the top of a tower with 20 m/s velocity. It took the ball 6 sec to fall to the bottom. How much distance did the ball cover in the last second of its motion?

1. 25 cm

2. 15 cm

3. 35 cm

4. 60 cm

Q.

The x-t graph and the v-t graph of a ball thrown up will a speed of 10 m/s at t = 0 till it comes back.

1. 

2. 

3. 

Q.

What is the acceleration of the ball at the highest point?

1. none of these

2. 0 m/s²

3. 9.8 m/s²

4. -9.8 m/s²