Work, Energy & Power Mock Tests

A body of mass 2 kg is moving with a velocity of 3 m/s. Its kinetic energy is:

A car of mass 1000 kg moving at 20 m/s is brought to rest in 5 s. The average power delivered by the brakes is:

Two identical balls collide head-on elastically. If ball A has velocity u and ball B has velocity -u before collision, after collision:

A body of mass 1 kg falls freely from a height of 20 m. Its kinetic energy just before hitting the ground is: (Take g = 10 m/s²)

A ball of mass 0.2 kg moving at 10 m/s collides head-on with a stationary ball of mass 0.3 kg. If the collision is perfectly elastic, the velocity of the 0.2 kg ball after collision is:

A spring of spring constant 200 N/m is compressed by 0.1 m. A block of mass 0.5 kg is placed against the spring on a frictionless surface. When the spring is released, the speed of the block is:

A car of mass 1000 kg moving with a velocity of 20 m/s is brought to rest by applying brakes. If the frictional force is 5000 N, the distance covered by the car before stopping is:

A car of mass 1000 kg moving with a velocity of 20 m/s is brought to rest by applying brakes over a distance of 50 m. The average braking force is: