Question 230: Gravitation

Question

The kinetic energy needed to project a body of mass $$m$$ from the earth surface (radius $$R$$) to infinity is

Accepted Answer

The required velocity is called escape velocity ($${v_e}$$) to leave the earth surface of a body.
$${v_e} = $$ escape velocity $$ = \sqrt {2gR} $$
Kinetic Energy $$K.E = {1 \over 2}mv_e^2$$
$$	herefore$$ $$K.E = {1 \over 2}m 	imes 2gR = mgR$$

Answer

$$mgR/2$$

Answer

$$2mgR$$

Answer

$$mgR$$

Answer

$$mgR/4$$

Gravitation

The kinetic energy needed to project a body of mass $m from the earth surface (radius R$) to infinity is

Choose the correct answer: