Physics-
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Easy

Question

A block of mass m is kept in an elevator which starts moving downward with an acceleration a subscript 0 end subscript as shown in figure. The block is observed by two observers A and B for a time interval t subscript 0 end subscript.According to observer B, the net work done on the block is

  1. negative fraction numerator 1 over denominator 2 end fraction m a to the power of 2 end exponent t subscript 0 end subscript superscript 2 end superscript    
  2. fraction numerator 1 over denominator 2 end fraction m a to the power of 2 end exponent t subscript 0 end subscript superscript 2 end superscript    
  3. fraction numerator 1 over denominator 2 end fraction m g a t subscript 0 end subscript superscript 2 end superscript    
  4. negative fraction numerator 1 over denominator 2 end fraction m g a t subscript 0 end subscript superscript 2 end superscript    

The correct answer is: fraction numerator 1 over denominator 2 end fraction m a to the power of 2 end exponent t subscript 0 end subscript superscript 2 end superscript

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