# A body is released from height equal to the radius of earth the velocity of the object when it strikes the surface is? 1) ✓gr 2) ✓2gr 3) 2✓gr

##### 1 Answer

Jun 12, 2018

#### Explanation:

The potential energy of a mass

Initially the mass is at rest at

Thus, from the law of conservation of energy, its speed

Now, the force on the mass at the surface of the earth is given by

Thus