Questions in Work, Energy and Power

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A space craft of mass M is moving with velocity V and suddenly explodes into two pieces. A part of it of mass m becomes at rest, then the velocity of other part will be
A ball hits a vertical wall horizontally at 10m/s bounces back at 10 m/s
A bullet of mass 50 gram is fired from a 5 kg gun with a velocity of 1km/s. the speed of recoil of the gun is
A body falling from a height of 10m rebounds from hard floor. If it loses 20% energy in the impact, then coefficient of restitution is
A body of mass ${m_1}$ moving with a velocity 3 ms–1 collides with another body at rest of mass ${m_2}.$After collision the velocities of the two bodies are 2 ms–1 and 5ms–1 respectively along the direction of motion of ${m_1}$ The ratio ${m_1}/{m_2}$ is
100 g of a iron ball having velocity 10 m/s collides with a wall at an angle ${30^o}$ and rebounds with the same angle. If the period of contact between the ball and wall is 0.1 second, then the force experienced by the ball is
Two bodies having same mass 40 kg are moving in opposite directions, one with a velocity of 10$m/s$ and the other with $7m/s.$ If they collide and move as one body, the velocity of the combination is
A body at rest breaks up into 3 parts. If 2 parts having equal masses fly off perpendicularly each after with a velocity of 12m/s, then the velocity of the third part which has 3 times mass of each part is
A particle falls from a height h upon a fixed horizontal plane and rebounds. If e is the coefficient of restitution, the total distance travelled before rebounding has stopped is
The bob A of a simple pendulum is released when the string makes an angle of ${45^o}$with the vertical. It hits another bob B of the same material and same mass kept at rest on the table. If the collision is elastic Question Image

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