KinematicsHard

Question

A boat which has a speed of 5km per hour in still water a river of width 1 km along the shortest possible path in fifteen minutes. The velocity if the river  water in km hour is : -

Options

A.1
B.2
C.3
D.

Solution

     
s = ut
1 = vBR cos θ t
1 = 5 cos θ
cos θ =⇒ θ = 37o
vR = vBR sin 37o = 5 × = 3 km/hr

Create a free account to view solution

View Solution Free
Topic: Kinematics·Practice all Kinematics questions

More Kinematics Questions

Rain water is falling vertically downward with velocity u. When velocity of the wind is u blown in the horizontal direct...In the arrangement shown in the figure the ends P and Q of an unstale string move downwards with uniform speed U. Pully ...A stone is projected horizontally with speed v from a height h above ground. A horizontal wind is blowing in direction o...When a particle moves in a circle with a uniform speed :-...When acceleration of 5 kg block is 2 m/s2 as shown in figure, then what will be the acceleration of 15 kg block :-...