A man weighing 80 kg is standing in a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of 1 m/s, then after 4 sec his displacement relative to the ground will be
1. 5 m
2. 4.8 m
3. 3.2 m
4. 3.0 m
A particle is projected at an angle with horizontal with an initital speed u. When it makes an angle with horizontal, its speed v is-
1.
2.
3.
4.
A particle is moving along the path y = from x = 0 m to x = 2 m. Then the distance traveled by the particle is:
1. 4 m
2.
3.
4.
A body is projected with velocity m/s with an angle of projection 60 with horizontal. Calculate velocity on that point where body makes an angle 30 with the horizontal.
1. 20 m/s
2.
3.
4. 10 m/s
In a uniform circular motion, which of the following quantity is not constant
1. Angular momentum
2. Speed
3. Kinetic energy
4. Momentum
A particle projected with kinetic energy with an angle of projection . Then the variation of kinetic K with vertical displacement y is
1. linear
2. parabolic
3. hyperbolic
4. periodic
A body is projected with a velocity u with an angle of projection . Change in velocity after the time (t) from the time of projection will be:
1. | gt | 2. | 1/2 gt2 |
3. | u sinθ | 4. | u cosθ |
A particle has initial velocity and has acceleration . Its speed after 10 s:
1. 7 units
2. units
3. 8.5 units
4. 10 units
The gravity in space is given by . Two particles are simultaneously projected with velocity and . Then, the ratio of their times of flight
1. 1:1
2. 1:2
3. 2:1
4. none
What determines the nature of the path followed by the particle?
(1) Speed only
(2) Velocity only
(3) Acceleration only
(4) None of these