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Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be:
Options
(a) 2v
(b) zero
(c) 1.5
(d) v
Correct Answer:
zero
Explanation:
If no external force actson a system of particles, the centre of mass remains as rest. So, speed of centre of mass is zero.
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Topics: Motion of system of Particles and Rigid Body
(73)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The height at which the weight of a body becomes 1/16 th, its weight
- A focal length of a lens is 10 cm. What is power of a lens in dioptre?
- A neutron is moving with a velocity u.It collides head on and elastically with an atom
- A ball moving with velocity 2 m/s collides head on with another stationary ball
- The half life of radioactive isotope ‘X’ is 50 years. It decays to
Topics: Motion of system of Particles and Rigid Body (73)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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