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Assertion (A): In the presence of air resistance, if the ball is thrown vertically upward then time of ascent is less than the time of descent. Reason(R): Force due to air friction always acts opposite to the motion of body.
If you tossed an object either up or down and could somehow eliminate the effects of air on its flight you would find that the object accelerates downward at a certain constant rate. The rate is called the free fall acceleration and its magnitude is represented by g. The acceleration is independent of the objects characteristics such as mass density or shape it is the same for all objects.
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