Physics-
General
Easy

Question

In a children’s park, there is a slide which has a total length of 10 m and a height of 8.0 m. A vertical ladder is provided to reach the top. A boy weighing 200 N climbs up the ladder to the top of the slide and slides down to the ground. The average friction offered by the slide is three-tenth of his weight. The work done by the slide on the boy as he comes down is

  1. Zero     
  2. +600 J    
  3. -600 J    
  4. +1600 J    

The correct answer is: -600 J


    F equals fraction numerator 3 over denominator 10 end fraction m g
    W equals negative F blank s blank o r blank W equals negative fraction numerator 3 over denominator 10 end fraction m g s
    or W equals negative fraction numerator 3 over denominator 10 end fraction cross times 200 cross times 10 blank J equals negative 600 blank J

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