Question

The escape velocity of a body on the surface of the Earth is 11.2 km/s. If the mass of the Earth is increase to twice its present value and the radius of the earth becomes half, the escape velocity becomes = …… kms^-1

(a) 5.6 

(b) 11.2 

(c) 22.4 

(d) 494.8

Answer 1

Correct answer is (c) 22.4

If M becomes double and R becomes half, then escape velocity becomes two times.