Work, Energy an...

A ball of weight 0.1 kg coming with speed 30 m/s strikes with a bat and returns in opposite direction with speed 40 m/s, then the impulse is (Taking final velocity as positive)

A billiard ball moving with a speed of 5 m/s collides with an identical ball originally at rest. If the first ball stops after collision, then the second ball will move forward with a speed of

A ball of mass m falls vertically to the ground from a height h₁ and rebound to a height h₂. The change in momentum of the ball on striking the ground is

A body of mass 50 kg is projected vertically upwards with velocity of 100 m/sec. 5 sec after this body breaks into 20 kg and 30 kg. If 20 kg piece travels upwards with 150 m/sec, then the velocity of other block will be

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 onto 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 hits a vertical wall horizontally at 10 m/s bounces back at 10 m/s

A hail 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

A body of mass m₁ moving with a velocity 3 ms^–1 collides with another body at rest of mass m₂. After collision the velocities of the two bodies are 2 ms^–1 and 5 ms^–1 respectively along the direction of motion of m₁. The ratio m₁ / m₂.

A body at rest breaks up into 3 parts. If 2 parts having equal masses fly off perpendicularly each after with a velocity of 12 m/s, then the velocity of the third part which has 3 times mass of each part is