Physics-
General
Easy

Question

A boat is sent across a river with a velocity of boat is 10 blank k m divided by h r. If the resultant velocity of boat is 10 blank k m divided by h r comma then velocity of the river is :

  1. 10 blank k m divided by blank h r  
  2. 8 blank k m divided by h r  
  3. 6 blank k m divided by h r  
  4. 4 blank k m divided by h r  

The correct answer is: 6 blank k m divided by h r


    Given stack A B with rightwards arrow on top equals Velocity of boat equals k m divided by h r
    stack A C with rightwards arrow on top equals Resultant velocity of boat equals 10 blank k m divided by h r
    stack B C with rightwards arrow on top equals Velocity of river
    equals square root of A C to the power of 2 end exponent minus A B to the power of 2 end exponent end root
    equals square root of open parentheses 10 close parentheses to the power of 2 end exponent minus open parentheses 8 close parentheses to the power of 2 end exponent end root equals 6 blank k m divided by h r

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