Physics

Problem

Planet A has mass

M

and radius

R

. Planet B has half the mass and half the radius of Planet A. If the escape velocities from the Planets A and B are

v_A

and

v_B

, respectively, then

\frac{v_A}{v_B} = \frac{n}{4}

The value of

n

is (a) 3 (c) 2 (b) 1 (d) 4