The Valley wickens when a river leaves the M
andentrs the s PC
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river is flowing wih velocity
. A boat is moving downstream. Velocity of boat in still water is
. A person standing on boat throws a ball vertically upwards w.r.t. himself with a velocity to
. At the topmost point the velocity of ball w.r.t. man standing on boat, w.r.t. river and w.r.t. ground respectively are
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