Question

A ball is heading at angle 127 degree from the direction of flow the velocity of boat in river is 5 km per hour and the velocity of flow of water is 4 kilometre per hour the displacement of water along the flow of water when width of river is 1200m is ans. 300m​

Answer 1

Answer:

the answer is 300 I think it

Answer 2

Answer:

The displacement is 4.11 m/s.

Explanation:

Given that,

Angle = 127°

Velocity of boat = 5 km/hr

Velocity of flow water = 4 k/h

Width = 1200 m

We need to calculate the  displacement

Using formula of resultant velocity

$v_{R}^2=v_{b}^2+v_{w}^2+2\times v_{b}v_{w}\cos\theta$

Put the value into the formula

$v_{R}^2=(5)^2+(4)^2+2\times5\times4\cos127$

$v_{R}=\sqrt{(5)^2+(4)^2+2\times5\times4\cos127}$

$v_{R}=4.11\ m/s$

Hence, The displacement is 4.11 m/s.