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Question

An aeroplane is moving with horizontal velocity u at height h.The velocity of a packet dropped from it on the earth’s surface will be (g is acceleration due to gravity)

  1. square root of u to the power of 2 end exponent plus 2 g h end root  
  2. square root of 2 g h end root  
  3. 2 g h  
  4. square root of u to the power of 2 end exponent minus 2 g h end root  

The correct answer is: square root of u to the power of 2 end exponent plus 2 g h end root


    Horizontal velocity of dropped packet equals u
    Vertical velocity equals square root of 2 g h end root
    therefore R e s u l t a n t blank v e l o c i t y blank a t blank e a r t h equals square root of u to the power of 2 end exponent plus 2 g h end root

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