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For a ball moving on a smooth frictionless surface, choose the correct option: (i) If no net force is applied, the velocity will remain the same / increase / decrease. (ii) If a net force acts in the direction of motion, the magnitude of velocity will remain the same / increase / decrease. (iii) If a net force acts opposite to the motion, the magnitude of velocity will remain the same / increase / decrease.
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(i) Remain the same — with no net force, velocity does not change (first law).
(ii) Increase — a force along the motion speeds the ball up.
(iii) Decrease — a force opposing the motion slows the ball down.
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