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A stone of weight W is thrown straight u...

A stone of weight W is thrown straight up from the ground with an intial speed u. If a drag force of constant magnitude f acts - on the same through out its flight , the speed of stone just before reaching the ground is
(1) `usqrt((W-f)/W)` (2) `usqrt((W+f)/f)`
(3)` u sqrt((W+f)/(W-f))` (4) ` u sqrt((W-f)/(W+f))`

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