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A ball is thrown vertically upwards at time t = 0. Air resistance is not negligible and the acceleration of free fall is g. The ball reaches a maximum height at time t = T and then descends, reaching terminal speed. Which graph best shows the variation with time t of the acceleration a of the ball

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answer is C.

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Detailed Solution

As the ball ascends upwards in addition to weight, air friction also acts downwards. Hence the initial magnitude of acceleration will be greater than magnitude of acceleration due to gravity. So the only possible option is

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