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.
From conservation of linear momentum we can see that velocity of 2m will become after collision (as mass is doubled)
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
A particle of mass 1 kg is kept at (1m, 1m, 1m). The moment of inertia of this particle about z-axis would be
4. None of these