Question

With the help of Second Law of Motion and the Universal Law of Gravitation derive an expression for acceleration due to gravity 'g'.

The weight of any person on the moon is about 1/6 times that on the earth. He can lift a mass of 15 kg on the earth. What will be the maximum, mass, which can be lifted by the same force applied by the person on the moon?

Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height 'h'. Assuming all conditions are identical, will these packets take same time to reach the surface of the earth? Justify your answer.

It is seen that a falling apple is attracted towards the earth. Does the apple also attract the earth? If so, we do not see the earth moving towards the apple. Why?