A river flows with a speed more than the maximum speed with which a person can swim in still water. He intends to cross the river by the shortest possible path (i.e., he wants to reach the point on the opposite bank which directly opposite to the starting point). Which of the following is correct ?

Options

A. He should normal to the river bank.
B. He should start in such a way that he moves normal to the bank, relative to the bank.
C. He should start in a particular (calculated) direction making an obtuse angle with the direction of water current.
D. The man cannot cross the river in that way.

Answer

D

Explanation

(d) We know that to cross the river by the shortest path,
`sin prop = (u)/(v)`
But `u gt v rArr sin prop gt 1`, which is not possible.
.