Explain how a cat is able to land on its feet after a fall taking advantage of the principle of conservation of angular momentum.

Establish the principle of conservation of angular momentum.

State the principle of conservation of energy.How can it be proved in case of a freely falling body?

A 200 g ball falls from rest through air. If its speed is 10 m/s after having through a distance of 20m, how much energy was lost due to friction against air?

How much momentum will a dumb-bell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration to be 10 ms^-2 .

A planet revolves around a massive star in a highly elliptical orbit. Is its angular momentum conserved over the entire orbit?

A body is allowed to fall from a height of 20 metres from the ground. How much time will take to reach the ground? What will be its velocity just a moment before hitting the ground?