A river of width d is flowing with a velocity u. A person starts from point A. He always try to keep himself along y axis. Speed of man w.r.t to river at any position is given by `v=ksqrt(y)(kto+ve` constant). Time taken by man to cross the river is (Assume that at t=0,y=0)A. `sqrt((d)/(k))`B. `2sqrt((d)/(k))`C. `(2sqrt(d))/(k)`D. `(2d)/(sqrt(k))`

A river of width d is flowing with a velocity u. A person starts from

1.	A river of width d is flowing with a velocity u. A person starts from point A. He always try to keep himself along y axis. Speed of man w.r.t to river at any position is given by `v=ksqrt(y)(kto+ve` constant). Time taken by man to cross the river is (Assume that at t=0,y=0)A. `sqrt((d)/(k))`B. `2sqrt((d)/(k))`C. `(2sqrt(d))/(k)`D. `(2d)/(sqrt(k))`
Answer» Correct Answer - C `t=int(dy)/(V_(y))=underset(0)overset(d)int(dy)/(Ky^(1//2))=(2sqrt(d))/(k)`

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