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A ball falls vertically downward and bou...

A ball falls vertically downward and bounces off a horizontal floor. The speed of the ball just before reaching the floor (`u_1`) is equal to the speed just after having contact with the floor (`u_2`) , `u_1 = u_2` . The corresponding magnitudes of accelerations are denoted respectively by `a_1` and `a_2` . The air resistance during motion is proportional to speed and is not negligible. If g is acceleration due to gravity, then–

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