A ball of mass 0.1 kg strikes a wall normally with a speed of 30 ms-1 and rebounds with a speed of 20 ms-1. The impulse of the force exerted by the wall on the ball is
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A ball of mass 0.1 kg strikes a wall normally with a speed of 30 ms-1 and rebounds with a speed of 20 ms-1. The impulse of the force exerted by the wall on the ball is