Which of the following best describes the motion of an object when the net external…
PHYSICS · Single correct · CBSE · Physics · Force and Laws of Motion · Force and Laws of Motion
Problem
Which of the following best describes the motion of an object when the net external force acting on it is zero?
(a) The object moves with constant acceleration in the direction of its initial velocity.
(b) The object either remains at rest or moves in a straight line with constant speed (constant velocity), because its state of motion does not change.
(c) The object must remain at rest since motion requires a net external force.
(d) The object can change direction while keeping the same speed because only a net force alters its speed, not its direction.