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

Subtopic:  Relative Motion |
 52%
From NCERT
PMT - 2002
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A particle is projected at an angle θ with horizontal with an initital speed u. When it makes an angle α with horizontal, its speed v is-

1. ucosθ

2. ucosθ ucosα

3. usinθsinα

4. ucosθcosα

 

Subtopic:  Projectile Motion |
From NCERT
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A particle is moving along the path y = x2 from x = 0 m to x = 2 m. Then the distance traveled by the particle is:

1.  4 m

2.  20 m

3.  >20 m

4.  <20 m

Subtopic:  Position & Displacement |
From NCERT
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A body is projected with velocity 203 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. 203 m/s

3. 103 m/s

4. 10 m/s

Subtopic:  Projectile Motion |
 66%
From NCERT
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In a uniform circular motion, which of the following quantity is not constant

1. Angular momentum

2. Speed

3. Kinetic energy

4. Momentum

Subtopic:  Circular Motion |
 53%
From NCERT
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A particle projected with kinetic energy k0 with an angle of projection θ. Then the variation of kinetic K with vertical displacement y is

1.  linear

2.  parabolic

3.  hyperbolic

4.  periodic

Subtopic:  Projectile Motion |
From NCERT
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A body is projected with a velocity u with an angle of projection θ. 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
Subtopic:  Projectile Motion |
 52%
From NCERT
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A particle has initial velocity 3i^+4j^ and has acceleration 0.4i^+0.3j^. Its speed after 10 s:

1. 7 units

2. 72 units

3. 8.5 units

4. 10 units

Subtopic:  Uniformly Accelerated Motion |
 78%
From NCERT
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The gravity in space is given by g=-10 j^ ms-2. Two particles are simultaneously projected with velocity u1=10 ms-1i^+10 ms-1j^ and u2=20 ms-1i^+10 ms-1j^. Then, the ratio of their times of flight

1. 1:1

2. 1:2

3. 2:1

4. none

Subtopic:  Projectile Motion |
 65%
From NCERT
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What determines the nature of the path followed by the particle?

(1) Speed only

(2) Velocity only

(3) Acceleration only

(4) None of these

Subtopic:  Projectile Motion |
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