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A swimmer crosses a river in shortest distance. If he tries to swim at 4 km/ hr maintaining 120 with the downstream then speed of the river is

Subhra , 5 Years ago
Grade 12th pass
anser 5 Answers
Saurabh Koranglekar

Last Activity: 5 Years ago

Dear student

Draw the vector triangle you would find 4 cos 60 = speed of river

Ie speed of river is 2 m/s

Regards

Khimraj

Last Activity: 5 Years ago

The speed of the river is 2 km/hr.
Explanation:
Given that,
Velocity of swimmer = 4 km/hr
Angle = 120°
We need to draw a figure,
Here,  is the velocity of swimmer w.r.to river,  is the velocity of river w.r. to ground and V is the velocity of swimmer w.r.to ground.
 
 
 
 
Put the value in equation (I)
 
 
Hence, The speed of the river is 2 km/hr.
 

aswanth nayak

Last Activity: 5 Years ago

Draw the vector triangle you would find 4 cos 60 = speed of riverIe speed of river is 2 m/The speed of the river is 2 km/hr.

Explanation:
Given that,
Velocity of swimmer = 4 km/hr
Angle = 120°
We need to draw a figure,
Here,  is the velocity of swimmer w.r.to river,  is the velocity of river w.r. to ground and V is the velocity of swimmer w.r.to ground.
Put the value in equation (I)
Hence, The speed of the river is 2 km/hr.

aswanth nayak

Last Activity: 5 Years ago

Dear student,Draw the vector triangle you would find 4 cos 60 = speed of riverIe speed of river is 2 m/s
 
 
 
Regards

aswanth nayak

Last Activity: 5 Years ago

Dear Student
 
 
The speed of the river is 2 km/hr.
Explanation:
Given that,
Velocity of swimmer = 4 km/hr
Angle = 120°
We need to draw a figure,
Here,  is the velocity of swimmer w.r.to river,  is the velocity of river w.r. to ground and V is the velocity of swimmer w.r.to ground.
 
 
 
 
Put the value in equation (I)
 
 
Hence, The speed of the river is 2 km/hr.
 

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