For a ball moving on a smooth frictionless surface, choose the appropriate option that will make the following statements physically correct.
(A) If no net force is applied on the ball, the velocity of the ball will remain the same/increase/decrease.
(B) If a net force is applied on the ball in the direction of its motion, the magnitude of the velocity of the ball will remain the same/increase/decrease.
(C) If a net force is applied on the ball in a direction opposite to the direction of its motion, the magnitude of the velocity of the ball will remain the same/increase/decrease.
(A) If no net force is applied on the ball, the velocity of the ball will remain the same. (According to Newton's first law, if net force is zero, there is no change in velocity.)
(B) If a net force is applied on the ball in the direction of its motion, the magnitude of the velocity of the ball will increase.
(The acceleration is in the direction of motion, so the speed increases.)
(C) If a net force is applied opposite to the direction of motion, the magnitude of the velocity of the ball will decrease.
(A force opposite to the motion produces retardation, so the speed decreases.)
