A man who can swim at velocity relative to water wants to cross a river of width

PHYSICS · Multi correct · CBSE · Physics · Motion in a Plane · Motion in a Plane

Problem

A man who can swim at velocity

v

relative to water wants to cross a river of width

b

, flowing with speed

u

. (1) The minimum time in which he can cross the river is

\frac{b}{v}

. (2) He can reach a point exactly opposite on the bank in time

t=\frac{b}{\sqrt{v^2-u^2}}

v>u

. (3) He cannot reach the point exactly opposite on the bank if

u>v

. (4) He cannot reach the point exactly opposite on the bank if

v>u