Physics-
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Question

A goa can travel at a speed of 8 k m h to the power of negative 1 end exponent in still water on a lake. In the flowing water of a stream, it can move at 8 k m h to the power of negative 1 end exponent relative to the water in the stream. If the stream speed is 3k m h to the power of negative 1 end exponent, how fast can the boat move past a tree on the shore in travelling (i) upstream (ii) downstream?

  1. 5 k m h to the power of negative 1 end exponent and 11 blank k m h to the power of negative 1 end exponent  
  2. 11 k m h to the power of negative 1 end exponent and 5 blank k m h to the power of negative 1 end exponent  
  3. 8 k m h to the power of negative 1 end exponent and 8 blank k m h to the power of negative 1 end exponent  
  4. 5 k m h to the power of negative 1 end exponentand 5 blank k m h to the power of negative 1 end exponent  

The correct answer is: 5 k m h to the power of negative 1 end exponent and 11 blank k m h to the power of negative 1 end exponent


    For upstream motion, kmh to the power of negative 1 end exponent=5k m h to the power of negative 1 end exponent
    For downstream motion,
    v equals open parentheses 8 plus 3 close parentheses k m h to the power of negative 1 end exponent equals 11 k m h to the power of negative 1 end exponent

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