A ball of mass m at rest starts moving from point A. The irregular surface is frictionless. The speed of the ball at the point C on the track is

                         

1.  4gH3

2.  2gH3

3.  gH

4.  Zero

Subtopic:  Work Energy Theorem |
 66%
From NCERT
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A ball strikes the floor and rebounds after an inelastic collision. Which of the following is correct?

(1)  The total momentum of the earth and ball system is conserved.

(2)  The total mechanical energy of the ball and earth system is conserved.

(3)  The momentum of the ball is conserved.

(4)  Both (1) & (2)

Subtopic:  Collisions |
 51%
From NCERT
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A ball is allowed to fall from a height of 10 m. If there is a 40% loss of energy due to impact, then after one impact ball will go up by

(1)  10 m

(2)  8 m

(3)  4 m

(4)  6 m

Subtopic:  Gravitational Potential Energy |
 72%
From NCERT
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A particle of mass m is moving with velocity v = 4i^ - 6j^ m/s collides on a horizontal smooth surface as shown. If the coefficient of restitution is  e = 12then the velocity of the particle after the collision is

                          

1.  v = 4i^ - 3j^ m/s

2.  v = 4i^ + 3j^ m/s

3.  v = 2i^ - 3j^ m/s

4.  v = 2i^ + 3j^ m/s

Subtopic:  Collisions |
 56%
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A sphere moving with speed u collides elastically with another identical sphere at rest. If the collision is not head-on, then the angle between their final velocities is

(1)  0°

(2)  60°

(3)  90°

(4)  45°

Subtopic:  Collisions |
 71%
From NCERT
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In a conservative field, work is done on a body by the field, then

(1)  The kinetic energy of the body definitely increases.

(2)  The kinetic energy of the body decreases.

(3)  The potential energy of the body increases.

(4)  Potential energy of the body decreases.

Subtopic:  Work Energy Theorem | Potential Energy: Relation with Force |
 54%
From NCERT
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Work is done by an agent applying force when

(1)  the applied force is variable.

(2)  the applied force is perpendicular to the motion.

(3)  the applied force generate motion.

(4)  the applied force is constant.

Subtopic:  Concept of Work |
 72%
From NCERT
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A ball is let to fall from a height of 32 m on the ground. The coefficient of restitution is e = 12. The height raised by the ball after the second rebound is

(1)  2 m

(2)  4 m

(3)  8 m

(4)  16 m

Subtopic:  Collisions |
 60%
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A bob of a simple pendulum is released from position A. Velocity of the bob when it is at lowest position A is

                                   

(1)  50 m/s

(2)  10 m/s

(3)  5 m/s

(4)  25 m/s

Subtopic:  Work Energy Theorem |
 74%
From NCERT
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A bob is suspended from a peg on a wall by a massless string of length L. If it is given velocity 2gL at the lowest point, then angular amplitude with which body will oscillate is

(1)  60°

(2)  90°

(3)  75°

(4)  30°

Subtopic:  Work Energy Theorem |
 74%
From NCERT
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