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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Three identical sphere lie at rest along a line on a smooth horizontal surface. The separation between any two adjacent spheres is L. The first sphere is moved with a velocity u towards the second sphere at time t=0. The coefficient of restitution for collision between any two blocks is 1/3. Then choose the correct statement

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Correct option: A

The third sphere will start moving at

t = \frac{{5L}}{{2u}}

Option A (The third sphere will start moving at

t = \frac{{5L}}{{2u}}

) is correct because it accounts for the time taken for the first sphere to collide with the second and then for the second to collide with the third, considering the coefficient of restitution.

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are related as : A solid metal ring and a disc of same radius and mass are rotating about their diameters with same angular frequency. The ratio of their respective rotational kinetic energy values is When a torque acting upon a system is zero, then which of the following will be constant A point particle of mass

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t = 1\,sec

\left( {rad\,{s^{ - 2}}} \right)