Q: A body A of mass m is moving in a circular orbit of radius R about a planet . Another body B of mass m/2 collides with A with a velocity which is half (v/2) the instantaneous velocity v of A . The collision is perfectly inelastic . Then the combined body
(a) escapes from the planet’s gravitational field
(b) starts moving in an elliptical orbit around the planet
(c) falls vertically downwards towards the planet
(d) continues to move in a circular orbit
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Ans: (b)