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Grade: 12th pass
        
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 
 
2 months ago

Answers : (5)

Saurabh Koranglekar
askIITians Faculty
2960 Points
							Dear student

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

Ie speed of river is 2 m/s

Regards
2 months ago
Khimraj
3008 Points
							
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.
 
2 months ago
aswanth nayak
66 Points
							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.
one month ago
aswanth nayak
66 Points
							
Dear student,Draw the vector triangle you would find 4 cos 60 = speed of riverIe speed of river is 2 m/s
 
 
 
Regards
one month ago
aswanth nayak
66 Points
							
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.
 
one month ago
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  • Test paper with Video Solution
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  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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