A model rocket of mass ill is fired upward from a launch pad with some initial speed, o. A gravitational force is exerted on the rocket: A. at all points in its motion except at it highest point. B. at all points in its motion. C. at no points in its motion. D. at none of these choices.

The correct answer is **B. at all points in its motion.**<br /><br />Gravity is a force that acts between any two objects with mass. The Earth exerts a gravitational force on the rocket regardless of the rocket's position or velocity. Even at the highest point of its trajectory, when the rocket momentarily stops before falling back down, the force of gravity is still acting on it, pulling it back towards the Earth.<br />