A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of

In a simple pendulum of length / the bob is pulled aside from its equilibrium position. through an angle 0 and then released. The bob passes through the equilibrium position with speed

When a long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be

If the kinetic energy of a particle is increased by 300%, the momentum of the particle will increase by

Two bodies with kinetic energies in the ratio 4 : 1 are moving with equal linear momentum. The ratio of their masses is

The kinetic energy acquired by a mass (m) in travelling distance (s) starting from rest under the action of a constant force is directly proportional to

Two bodies of masses m and 4 m are moving with equal K.E. The ratio of their linear momenta is

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