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
A boat is sent across a river in perpendicular direction with a velocity of 8 km/hr. If the resultant velocity of boat is 10 km/hr, then velocity of the river is :
(1) 10 km/hr
(2) 8 km/hr
(3) 6 km/hr
(4) 4 km/hr
A river is flowing from W to E with a speed of 5 m/min. A man can swim in still water with a velocity 10 m/min. In which direction should the man swim so as to take the shortest possible path to go to the south.
(1) 30° with downstream
(2) 60° with downstream
(3) 120° with downstream
(4) South
A train is moving towards east and a car is along north, both with same speed. The observed direction of car to the passenger in the train is
(1) East-north direction
(2) West-north direction
(3) South-east direction
(4) None of these
A ball P is dropped vertically and another ball Q is thrown horizontally from the same height and at the same time. If air resistance is neglected, then
(1) Ball P reaches the ground first
(2) Ball Q reaches the ground first
(3) Both reach the ground at the same time
(4) The respective masses of the two balls will decide the time
A frictionless wire AB is fixed on a sphere of radius R. A very small spherical ball slips on this wire. The time taken by this ball to slip from A to B is:
1.
2.
3.
4.
A body is slipping from an inclined plane of height h and length l. If the angle of inclination is θ, the time taken by the body to come from the top to the bottom of this inclined plane is:
1.
2.
3.
4.