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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

(6)

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