Physics-
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Question

A goods train is moving with constant acceleration. when engine passes through a signal its speed is U. Midpoint of the train passes the signal with speed V. What will be the speed of the last wagon?

  1. square root of fraction numerator V to the power of 2 end exponent minus U to the power of 2 end exponent over denominator 2 end fraction end root    
  2. square root of fraction numerator V to the power of 2 end exponent plus U to the power of 2 end exponent over denominator 2 end fraction end root    
  3. square root of fraction numerator 2 text end text V to the power of 2 end exponent minus U to the power of 2 end exponent over denominator 2 end fraction end root    
  4. square root of 2 V to the power of 2 end exponent minus U to the power of 2 end exponent end root    

The correct answer is: square root of 2 V to the power of 2 end exponent minus U to the power of 2 end exponent end root

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