The escape velocity of a body on the surface of the earth is . If the earth’s mass increases to twice its present value and the radius of the earth becomes half, the escape velocity would become 

a) 
b) 
(remain unchanged) 

c) 
d) 
The escape velocity of a body on the surface of the earth is . If the earth’s mass increases to twice its present value and the radius of the earth becomes half, the escape velocity would become 

a) 
b) 
(remain unchanged) 

c) 
d) 
(c) If becomes double and becomes half then escape velocity becomes two times 