1.

The escape velocity of a sphere of mass m from earth having mass M and radius R is given by [NCERT 1981, 84; CBSE PMT 1999]

A.                  \[\sqrt{\frac{2GM}{R}}\]
B.               \[2\sqrt{\frac{GM}{R}}\]
C.             \[\sqrt{\frac{2GMm}{R}}\]
D.               \[\sqrt{\frac{GM}{R}}\]
Answer» B.               \[2\sqrt{\frac{GM}{R}}\]


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