# Mark the correct statement(s): 1. Internal forces cannot increase the kinetic energy of a system. 2. Internal forces may increase the kinetic energy of a system. 3. Work done by kinetic friction is always negative. 4. Both (2) & (3)

Subtopic:  Concept of Work |
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A bullet fired towards a wall reduces its kinetic energy by half after the penetration of 6 cm. The further penetration of the bullet into the wall is:

1. 2 cm

2. 1 cm

3. 6 cm

4. 3 cm

Subtopic:  Work Energy Theorem |
55%
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A body having an initial kinetic energy 2 J collides with an identical body at rest. The maximum loss of kinetic energy in the collision will be:

 1 2 J 2 Zero 3 1 J 4 1.5 J
Subtopic:  Collisions |
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What is the work done by gravity on block A in 2 seconds after the blocks are released? (Pulley is light)

1.  240 J

2.  200 J

3.  120 J

4.  24 J

Subtopic:  Gravitational Potential Energy |
61%
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A weight 'mg' is suspended from a spring. The energy stored in the spring is U. The elongation in the spring is:

1.  $\frac{2\mathrm{U}}{\mathrm{mg}}$

2.  $\frac{\mathrm{U}}{\mathrm{mg}}$

3.  $\frac{\sqrt{2}\mathrm{U}}{\mathrm{mg}}$

4.  $\frac{\mathrm{U}}{\sqrt{2}\mathrm{mg}}$

Subtopic:  Elastic Potential Energy |
62%
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The energy required to accelerate a car from rest to 30 m/s is E. The energy required to accelerate the car from 30 m/s to 60 m/s will be:

 1 E 2 2E 3 3E 4 4E
Subtopic:  Work Energy Theorem |
67%
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The speed of a particle moving in a circular path decreases with time. The instantaneous power due to the force acting on it will be:

1.  Positive

2.  Negative

3.  Zero

4.  Maybe positive or negative

Subtopic:  Power |
57%
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A body of mass m moving with speed v collides head-on elastically with another identical body at rest. The percentage loss in kinetic energy of the first body will be:

 1 0% 2 25% 3 50% 4 100%
Subtopic:  Collisions |
53%
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A body is obliquely projected from the horizontal ground. The magnitude of gravity's power delivered during its motion from the ground to the topmost point is:

 1 Constant 2 Increases continuously 3 Decreases continuously 4 May increase or decrease depending on the angle of projection

Subtopic:  Power |
51%
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In the given figure, a man pulls the mass m with the help of a rope. Work done by the man against gravity when mass is lifted by 0.5 m is: (g = 10 $\mathrm{m}/{\mathrm{s}}^{2}$)

1. 50 J
2. 100 J
3. 25 J
4. Zero

Subtopic:  Gravitational Potential Energy |
62%
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