Gravitation doubt.... This is supposedly a simple conceptual problem but I still have a doubt about this: A satellite is orbitting the earth with a constant speed when suddenly the force of gravitation disappears(no explanation as to how that happened!). Then the satellite will: a) continue to move in its orbit with the same velocity. b) move tangentially to the orginal orbit with the same velocity. c) become stationary in its orbit. d) move towards the earth. Now I know I can safely eliminate (a) and (d). My answer was (b), since by conservation of momentum in the absence of any external force, the body will continue moving in a straight line with constant speed. But the MCQ book I was referring to says that the answer is (c) giving the explanation that when the gravitational force becomes zero, then centripetal force on satellite becomes zero and therefore, the satllite will become stationary in orbit. I am puzzled..... should i throw the book out of my window or is its answer correct?