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[" 30.A ball is dropped from "a" hoipht ...

[" 30.A ball is dropped from "a" hoipht of "bm" onter a suridy flow "],[" and penetrater the and "ap" to "10cm" before coming "w" ."],[" rest.Find the retardation of the ball in wand angurning "],[" it to be uniform."]

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