1unless one of them is seeing through high power lenses [3]
A book is lifted from the floor and is kept in an almirah.One person says that the potential energy of the book is increased by 20J & the other says it is increased by 30 J . Is one of them necessarily wrong ?
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4 Answers
24Yes one of them will be wrong......
becoz no matter what refrence we take while calculating change in potential enrgy...the thing that matters is inital and final position...
11it may or may not be so
as book has appreciable mass we wil say its G.P.E=mgh
let us assume that a person is standing 10 m below the first observer
so ths is possible
CORRECT ME IN CASE I AM WRONG
24i thought that way also.......
but initial and final position of book are fixed.....so it doesnt matter where the observer is placed......
