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A ball of mass 1 kg drops vertically on to the floor with a speed of 25 m/s. It rebounds with an initial velocity of 10 m/s. What impulse acts on the ball during contact? (A) 35kg m/s downwards (B) 35 kg m/s upwards (C) 30 ka m/s downwards (D) 30kg m/s upwards

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