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A 0.75 kg rock is projected from the edge of the top of a building with an initial velocity of 10.2 m/s at an angle 40? above the horizontal. The building is 7.12 m in height. At what horizontal distance, x, from the base of the building will the rock strike the ground? Assume the ground is  level and that the side of the building is vertical. The acceleration of gravity is 9.8 m/s2 .

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