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Q.

If the mass of the earth is M, its radius is R and gravitational constant is G, then the speed required to be given to a projectile so that it does not return to earth is

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a

$\sqrt{GRM}$

b

$\sqrt{\frac{GM}{R}}$

c

$\sqrt{\frac{2 GM}{R}}$

d

$\sqrt{\frac{GR}{M}}$

answer is B.

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Detailed Solution

$V_{e} = \sqrt{\frac{2 GM}{R}}$

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