physics grade 12

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we have a trebuchet. if the arm of the trebuchet fires in a circular motion with a radius of 2.0 m and the mass is 50kg on the other end of the arm. what will the speed of the 4 kg boulder be as it is launched into the air? assuming it is launched parallel to the ground at a height of twice the radius, how far will the boulder travel before hitting the ground.

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