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A mass of 6 × 10

A mass of 6 × 1024 kg  is to be compressed in a sphere in such a way that the escape velocity from the sphere is 3 × 108 m/s . Radius of the sphere should be  (G = 6.67×10-11 N-m2/kg2)

(a)  9 km                                   (b)  9 m

(c)   9 cm                                   (d)  9 mm

Answer:  d

 

 

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