A stone is thrown with an initial speed of 4.9 m/s from a bridge in vertically upward direction. It falls down in water after 2 sec. The height of the bridge is 

1. 4.9 m

2. 9.8 m

3. 19.8 m

4. 24.7 m

A stone is shot straight upward with a speed of 20 m/sec from a tower 200 m high. The speed with which it strikes the ground is approximately 

1. 60 m/sec

2. 65 m/sec

3. 70 m/sec

4. 75 m/sec

A body freely falling from the rest has a velocity ‘v’ after it falls through a height ‘h’. The distance it has to fall down for its velocity to become double, is 

1. 2 h

2. 4 h

3. 6 h

4. 8 h

Velocity of a body on reaching the point from which it was projected upwards, is 

1. $v=0$

2. $v=2u$

3. $v=0.5u$

4. $v=-u$

A body projected vertically upwards with a velocity u returns to the starting point in 4 seconds. If g = 10m/sec², the value of u is  

1. 5 m/sec

2. 10 m/sec

3. 15 m/sec

4. 20 m/sec

Time taken by an object falling from rest to cover the height of h₁ and h₂ is respectively t₁ and t₂ . Then the ratio of t₁ to t₂ is 

1. h₁ : h₂

2. $\sqrt{h_1}:\sqrt{h_2}$

3. h₁ : 2h₂

4. 2h₁ : h₂

A body is thrown vertically up from the ground. It reaches a maximum height of \(100\) m in \(5\) s. After what time will it reach the ground from the position of maximum height?

A body thrown vertically upwards with an initial velocity u reaches maximum height in 6 seconds. The ratio of the distances travelled by the body in the first second and the seventh second is 

1. 1 : 1

2. 11 : 1

3. 1 : 2

4. 1 : 11

A particle is thrown vertically upwards. If its velocity at half of the maximum height is 10 m/s, then maximum height attained by it is (Take g = 10 m/s²) 

1. 8 m

2. 10 m

3. 12 m

4. 16 m

A body, thrown upwards with some velocity, reaches the maximum height of 20m. Another body with double the mass thrown up, with double initial velocity will reach a maximum height of 

1. 200 m

2. 16 m

3. 80 m

4. 40 m