A ball is thrown upward with a certain speed. It passes through the same point at 3 second and 7 second from the start. The maximum height achieved by the ball is:
1. 500 m
2. 250 m
3. 125 m
4. 450 m
For the following acceleration versus time graph the corresponding velocity versus displacement graph is
1.
2.
3.
4.
A body thrown vertically so as to reach its maximum height in t second. The total time from the time of projection to reach a point at half of its maximum height while returning (in second) is:
1.
2.
3.
4.
A stone falls freely from rest from a height h and it travels a distance in the last second. The value of h is:
1. 145 m
2. 100 m
3. 125 m
4. 200 ms
A particle is thrown upwards from ground. It experiences a constant resistance force which can produce retardation of 2 . The ratio of time of ascent to the time of descent is:
(1) 1:1
(2)
(3)
(4)
A bullet loses of its velocity passing through a plank. The least number of planks required to stop the bullet is (All planks offers same retardation)
(1) 10
(2) 11
(3) 12
(4) 23
A point moves with uniform acceleration and v1, v2 and v3 denote the average velocities in the three successive intervals of time t1, t2 and t3. Which of the following relations is correct ?
(1)
(2)
(3)
(4)
The initial velocity of the particle is 10 m/sec and its retardation is 2 m/sec2. The distance moved by the particle in 5th second of its motion is
(1) 1 m
(2) 19 m
(3) 50 m
(4) 75 m
A motor car moving with a uniform speed of 20 m/sec comes to stop on the application of brakes after travelling a distance of 10 m. Its acceleration is
(1) 20 m/sec2
(2) –20 m/sec2
(3) –40 m/sec2
(4) +2 m/sec2
The velocity of a body moving with a uniform acceleration of 2 m/sec2 is 10 m/sec. Its velocity after an interval of 4 sec is
(1) 12 m/sec
(2) 14 m/sec
(3) 16 m/sec
(4) 18 m/sec