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Question

A boat is sent across (perpendicularly) w.r.t. to the river flow with a velocity of 12 kmh1. If the resultant velocity of the boat is 13 kmh1, the river is flowing with a velocity of
 


A
12 kmh1
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B
13 kmh1
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C
5 kmh1
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D
None of the above
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Solution

The correct option is C 5 kmh1
Let the velocity of the river be v.

From the figure,

122+v2=132(using Pythagoras theorem)
v=5 km/h

 

Physics

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