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A loaded 20,000 kg coal wagon is moving on a level track at 6ms to the power of negative 1 end exponent. Suddenly 5000 kg of coal is dropped out of the wagon. The final speed of the wagon is
 

  1. 6 ms to the power of negative 1 end exponent
  2. 8 ms to the power of negative 1 end exponent
  3. 4.8 ms to the power of negative 1 end exponent
  4. 4.5 ms to the power of negative 1 end exponent

The correct answer is: 6 ms to the power of negative 1 end exponent

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