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A block of mass m = 3kg resting on a hor...

A block of mass `m = 3kg` resting on a horizontal frictionless flooe is horizontally struck by a 9N force that acts for 0.02 sec. After 3 sec it receivers a second blow of force 9 N but in opposite direction which acts for 0.01 sec. The speed of the body after 30 sec is

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