MEDIUM
JEE Main/Advance
IMPORTANT
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A system of particles has its centre of mass at the origin. The x-coordinates of all the particles

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Important Questions on Centre of Mass, Momentum and Collisions

MEDIUM
JEE Main/Advance
IMPORTANT
In which of the following cases the centre of mass of a system is certainly not at its centre ?
EASY
JEE Main/Advance
IMPORTANT
If the net external force acting on a system is zero, then the centre of mass
EASY
JEE Main/Advance
IMPORTANT
In an elastic collision in absence of external force, which of the following is/are correct?
EASY
JEE Main/Advance
IMPORTANT
A small ball collides with a heavy ball initially at rest. In the absence of any external impulsive force, 
MEDIUM
JEE Main/Advance
IMPORTANT
A block moving in air explodes in two parts. Then, just after the explosion (neglect change in momentum due to gravity)
EASY
JEE Main/Advance
IMPORTANT
Two bodies of the same masses collide head-on elastically, then
EASY
JEE Main/Advance
IMPORTANT
External force F(F  0) acts on a system of particles. The velocity and the acceleration of the centre of mass are found to be vcm and acm at an instant, then it is possible that
EASY
JEE Main/Advance
IMPORTANT
A bag of mass M hangs by a long thread, and a bullet (mass m) comes horizontally with velocity v and gets caught in the bag. Then for the combined system (bag and bullet) is