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Escape velocity on the surface of earth is 11.2 km/s . Escape velocity from a planet whose mass is the same as that of earth and radius 1/4 that of earth is

(a)  2.8 km/s                            (b)  15.6 km/s

(c)   22.4 km/s                          (d)  44.8 km/s

Answer: c

(12)

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