$A$ stone is dropped from a cliff. Its speed after it has fallen $100 \,m$ is: (in $, m s^{-1}$)

What is the acceleration due to gravity at the centre of the earth (in $m/s^2$)?

Give an example of the motion of an object under the influence of gravitational force on Earth.

$A$ girl stands on a box having $60 \,cm$ length,$40 \,cm$ breadth,and $20 \,cm$ width in three ways. In which of the following cases will the pressure exerted by the box be maximum?

An apple falls from a tree because of gravitational attraction between the earth and the apple. If $F_1$ is the magnitude of force exerted by the earth on the apple and $F_2$ is the magnitude of force exerted by the apple on the earth,then:

What will happen if the force of gravity disappears suddenly?