The escape velocity of a body on the surface of the earth is 11.2 km/s. 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) 5.6 km/s
(b) 11.2 km/s (remain unchanged)
(c) 22.4 km/s
(d) 44.8 km/s
Answer: c
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