A child swinging  a swing. Minimum and maximum heights of swing from earth’s  surface are 0.75 m and 2m respectively. The maximum velocity of this swing is 

An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of water jet. What is the rate at which kinetic energy is imparted to water? 

A body of mass m moving with velocity 3 km/h collides with a body of mass 2.m at rest. Now the coalesced mass starts to move with a velocity 

An explosion blows a rock into three parts. Two parts go off at the right angles to each other. These two are, 1kg first part moving with a velocity of 12 ms^-1 and 2kg second part moving with  a velocity of 8ms^-1. If the third part flies off with a velocity of 4ms^-1, its mass would be 

Two masses 1g and 9g are moving with equal kinetic energies. The ratio of the magnitudes of their respective linear momenta is

How much water  a pump of 2 k W can raise in one minute to a height of 10 m.? (Take g = m/s²)

If kinetic energy of a body is increased by 300% then the percentage change in momentum will be

The identical balls A and B moving with velocities + 0.5 m/s and -0.3 m/s respectively collide head on elastically. The velocity of the balls A and B after collision will be respectively

A stationary particle explodes into two particles of masses m₁ and m₂ which move in opposite directions with velocities v₁ ad v₂. The ratio of their kinetic energies E₁ / E₂ is

The coefficient of restitution  e for a perfectly elastic collision