Select a suitable alternative for the blank.
The _____ softness is favourable for the plantation of rice.
Earth’s
Earth
Earths’
Earths
The earth’s softness is favourable for the plantation of rice.
A body of mass m is dropped from a height h equal to the radius of the earth (R) above the tunnel dug through the earth as shown in the figure. Ignore the effect of earths rotation and air resistance, M is mass of earth. Choose the correct alternative(s):