# NEET Practice Questions - Physics - Systems of Particles and Rotational Motion

• Subject:

Physics

• Chapter:

Systems of Particles and Rotational Motion

A block of mass m moving at a velocity v collides with another block of mass 2m at rest. The lighter block comes to rest after collision. Find the coefficient of restitution.

(a) $\frac{1}{2}$                                               (b) $1$

(c) $\frac{1}{3}$                                               (d) $\frac{1}{4}$

A small mass attached to a string rotates on a frictionless table top as shown. If the tension on the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will

(a) Increase by a factor of 4                                       (b) Decrease by a factor of 2

(c) Remain constant                                                   (d) Increase by a factor of 2

PMT

PMT

PMT

PMT