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An old English nursery rhyme starts off "Jack and Jill went up the hill to fetch a pail of water". If the hill is 10 m high and Jack weighs 700 N, how much

work in Joules did Jack need to do to get to the top of the hill?


Since the displacement S=10m
and he has to do work apposing its weight =700 N
therefore work done =700 x - 10
                              =-7000 J ans 
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WORK DONE = force×displacement =700×10=7000 N
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