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A person is standing on the roof of a tall building. She throws a ball from the top of the building in such a way that when the ball passes a window cleaner who is 2.0m from the top, it is falling at a speed of 7.0m/s. It takes another 2.9s to reach the ground.

a. How tall is the building?

b. How fast is the ball moving when it hits the grounds?

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Reference No.:- M91011835

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