JEE Main 2019 — Physics solution

JEE Main2019Physics

A satellite is revolving in a circular orbit at a height h from the earth surface, such that h << R where R is the radius of the earth. Assuming that the effect of earth’s atmosphere can be neglected the minimum increase in the speed required so that the satellite could escape from the gravitational field of eath is.

A
$2 g R$
B
$g R (2 - 1)$
C
$g R$
D
$\frac{g R}{2}$

Solution

$V_{o} = 2 g R V_{e} = 2 g R Δ V = g R (2 - 1)$

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