Work, Energy an...

Two equal masses m₁ and m₂ moving along the same straight line with velocities +3 m/s and –5 m/s respectively collide elastically. Their velocities after the collision will be respectively

A rubber ball is dropped from a height of 5 m on a planet where the acceleration due to gravity is not known. On bouncing, it rises to 1.8 m. The ball loses its velocity on bouncing by a factor of

At high altitude, a body explodes at rest into two equal fragments with one fragment receiving horizontal velocity of 10 m/s. Time taken by the two radius vectors connecting point of explosion to fragments to make 90° is

If two balls each of mass 0.06 kg moving in opposite directions with speed 4 m/s collide and rebound with the same speed, then the impulse imparted to each ball due to other is

A steel ball of radius 2 cm is at rest on a frictionless surface. Another ball of radius 4 cm moving at a velocity of 81 cm/sec collides elastically with first ball. After collision the smaller ball moves with speed of

A ball is projected vertically down with an initial velocity from a height of 20 m into a horizontal floor.During the impact it loses 50% of its energy and rebounds to the same height. The initial velocity of its projection is

A ball is allowed to fall from a height of 10 m. If there is 40% loss of energy due to impact, then after one impact ball will go up to

Two masses m_A and m_B moving with velocities v_A and v_B in opposite directions collide elastically. After that the masses m_A and m_B move with velocity v_B and v_A respectively. The ratio (m_A / m_B) is

Two bodies having same mass 40 kg are moving in opposite direction, one with a velocity of 10 m/s and the other with 7 m/s. If they collide and move as one body, the velocity of the combination is

A ball of mass m moving with velocity V, makes a head on elastic collision with a ball of the same mass moving with velocity 2V towards it. Taking direction of V as positive velocities of the two balls after collision are