Hard

Question

A boat which has speed of 5 km/h in still water across a river of width 1 km along the shortest possible path in 15 min. The velocity of the river water in km/h

Options

A.1
B.3
C.4
D.√41

Solution

         
Shortest possible path comes when absolute velocity of boatman comes perpendicular to the river current as shown in figure
t = =
∴
Solving this equation, we get vr = 3 km/h
∴ Correct answer is (b)

Create a free account to view solution

View Solution Free

More Physics Questions

Two stones A and B are projected from an inclined plane such that A has range up the incline and B has range down the in...The velocity of projection of a projectile is (6î + 8ĵ) ms-1. The horizontal range of the projectile is...A particle moves a distance x in the time t according to equation x = (t + 5)-1 . The acceleration of particle is propor...On an inclined plane of inclination 30o, a ball is thrown at an angle of 60o with the horizontal from the foot of the in...The coordinate of a particle moving in a plane are given by x (t) = a cos ( pt) and y (t) = bsin ( pt) , where a, b (...