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Grade: 12th pass
        
Pls answer this question given in attachment !! 
 
 
 
 
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one year ago

Answers : (1)

Arun
23489 Points
							
The man swims  perpendicular to the flow or velocity of river water.
speed of man = 5 kmph  wrt water
boat is going upstream , velocity wrt water = 12 kmph
velocity of water in the river = 2 kmph
The vector component of velocity of water downstream is added to both boatman and the swimmer.  When we find the relative velocity of the swimmer wrt boatman, that will be canceled.
relative velocity of swimmer wrt boatman 
   = velocity of swimmer -  velocity of boatman      (vector subtraction)
  
as angle between the two vectors is 90 deg,
magnitude of relative velocity =  √(5² + 12²)  = 13  kmph
 
     direction:  at an angle of tan⁻¹ (12/5) to the flow of water.
 
Regards
Arun
one year ago
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