Question

A satellite is moving with a constant speed v in circular orbit around the earth. An object of mass 'm' is ejected from the satellite such that it just escapes from the gravitational pull of the earth. At the time of ejection, the kinetic energy of the object is :

(1)  mv² 

(2) 1/2 mv² 

(3) 2mv² 

(4) 3/2 mv² 

Answer 1

Correct option: (1) mv²

Explanation:

For object to escape its KE should be equal to |PE| of the orbit of object