Work is always done on a body when

Options :
  1. a force acts on it
  2. it moves through a certain distance
  3. it experiences an increase in energy through a mechanical influence
  4. none of the above
Answer and Explanation :-

Answer: Option 3

Explanation:

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Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.
-Mark Haddon The Curious Incident of the Dog in the Night-Time