Find the mass of a body which has 5J of kinetic energy while moving at a speed of 2m/s.

A 10 kg ball is dropped from a height of 10m. Find

(a) the initial potential energy of the ball ,

(b) the kinetic energy just before it reaches the ground

(c) the speed just before it reaches the ground.

Calculate the work done by a person in lifting a load of 20 kg from the ground and placing it 1m high on a table

A cycle together with its rider weighs 100kg. How much work is needed to set it moving at 3 m/s.

When the speed of a ball is doubled its kinetic energy

(a) Remains same

(b) gets doubled

(c) Becomes half

(d) becomes 4 times