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[" 38.A ball projected from ground verti...

[" 38.A ball projected from ground vertically upward is at "],[" same height at time "t_(1)" and "t_(2)" .The speed of "],[" projection of ball is [Neglect the effect of air "],[" resistance] "],[[" (1) "g[t_(2)-t_(1)]," (2) "(g[t_(1)+t_(2)])/(2)],[" (3) "(g[t_(2)-t_(1)])/(2)," (4) "g[t_(1)+t_(2)]]]

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