A body falls freely under gravity from rest and reaches the ground in time t. Write an expression for the height fallen by the body.

A body is thrown vertically upwards with an initial velocity u. Write an expression for the maximum height attained by the body.

The value of g at the center of the earth is zero. What will be the weight of a body of mass m kg at the center of the earth ?

Which of the following quantity does not change by change of place of a body — mass or weight ?