The momentum is given by p=4t+1, the force at t=2s is-[Given: F=dPdt]

(A)  4 N

(B)  8 N

(C)  10 N

(D)  15 N

Subtopic:  Newton's Laws |
 79%
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If the momentum of a particle is given by P=(180-8t) kg m/s, then its force will be-[Given: F=dPdt]

(1)  Zero

(2)  8 N

(3)  -8 N

(4)  4 N

Subtopic:  Newton's Laws |
 83%
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A force F=6i^-8j^+10k^ Newton produces acceleration 1 m/s2 in a body. The mass of the body is (in kg)

(1)  6i^-8j^+10k^

(2)  100

(3)  102

(4)  10

Subtopic:  Newton's Laws |
 75%
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Momentum of a body moving in a straight line is p=t2+2t+1 kg m/s. Find the force acting on a body at t=2 sec

(1)  6 N

(2)  8 N

(3)  4 N

(4)  2 N

Subtopic:  Newton's Laws |
 83%
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Mathematical Tools questions are over , now starting Laws of Motion questions

When a ball of mass = 5kg hits a bat with a velocity = 3 m/s, in positive direction and it moves back with a velocity = 4 m/s, find the impulse in SI units

1. 5 

2. 15

3. 25

4. 35

Subtopic:  Newton's Laws |
 57%
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A particle of mass m has momentum p. it's kinetic energy will be 

1.  mp

2.  p2m

3.  p2m

4.  p22m

Subtopic:  Newton's Laws |
 84%
From NCERT
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A particle of mass 15 kg has an initial velocity vi = i^ - 2j^ m/s. It collides with another body and the impact time is 0.1 s, resulting in a velocity vf = 6i^ + 4j^ + 5k^ m/s after impact. The average force of impact on the particle is

1.  155i^ + 6j^ + 5k^

2.  155i^ + 6j^ - 5k^

3.  1505i^ - 6j^ + 5k^

4.  1505i^ + 6j^ + 5k^

Subtopic:  Newton's Laws |
 64%
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A particle of mass m at rest is acted upon by a constant force F for a time t. Its kinetic energy after an interval t is 

1.  F2t2m

2.  F2t22m

3.  F2t23m

4.  Ft2m

Subtopic:  Newton's Laws |
 81%
From NCERT
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The magnitude of the impulse developed by a mass of 0.2 kg which changes its velocity from 5i^ - 3j^ + 7k^  m/s to 2i^ + 3j^ + k^ m/s is

1.  2.7 N-s

2.  1.8 N-s

3.  0.9 N-s

4.  3.6 N-s

Subtopic:  Newton's Laws |
 77%
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A soldier is firing 20 bullets per second from his gun having a muzzle speed of 150 m/s. The mass of each bullet is 50 g. If they strike the wall and rebound with the same speed, then the force on the wall is

1.  75 N

2.  150 N

3.  300 N

4.  600 N

Subtopic:  Newton's Laws |
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