For statement (i) the velocity will remain the same. For statement (ii) the magnitude of velocity will increase. For statement (iii) the magnitude of velocity will decrease due to opposing acceleration.
For a ball moving on a smooth frictionless surface, choose the appropriate option that will make the following statements physically correct. (i) If no net force is applied on the ball, the velocity of the ball will remain the same/increase/decrease. (ii) 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. (iii) 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.
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In (i), according to Newton’s first law, an object continues moving at constant velocity without external force, so it will remain the same. In (ii), a forward net force causes acceleration in the direction of motion, so the magnitude of velocity will increase. In (iii), an opposing net force creates negative acceleration opposing motion, so the magnitude of velocity will decrease.
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