Given mass of the moon is 1/81 of the mass of the earth and corresponding radius is 1/4 of the earth. If escape velocity on the earth surface is 11.2 km/s, the value of same on the surface of the moon is
(a) 0.14 km/s (b) 0.5 km/s
(c) 2.5 km/s (d) 5 km/s
Answer: c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a