To project a body of mass from earth's surface to infinity

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

To project a body of mass

m

from earth's surface to infinity, the required kinetic energy is (assume, the radius of earth is

R_e

g =

acceleration due to gravity on the surface of earth) : (1)

2mgR_e

(2)

mgR_e

(3)

\frac{1}{2}mgR_e

(4)

4mgR_e