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a ball of mass 2kg is kicked from the edge of the flat roof of a...

a ball of mass 2kg is kicked from the edge of the flat roof of a small building. the initial velocity of the ball makes an angle of 30° with the horizontal, and the magnitude of the initial velocity is 1 m/s. If the ball is moving at a speed of 9 m/s and it hits the ground, how tall is the building?

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