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A ball is dropped from a building of height 45 m. Simultaneously another ball is thrown up with a speed 40 m/s.

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A ball is dropped from a building of height 45 m. Simultaneously another ball is thrown up with a speed 40 m/s. Calculate the relative speed of the balls as a function of time.

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Both are free falling. Hence, there is no acceleration of one w.r.t. another. Therefore, relative speed remains constant (=40 m/s ).

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