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Work, Energy And Power

Question
CBSEENPH11017113

A spring of constant k is stretched to x1 . What is the additional work required to extend the spring to x2?

Solution

The spring is stretched to x1
Again, the spring has been stretched to x2
So, additional work required to extend the spring is given by, 
                       1 half straight k left parenthesis straight x subscript 2 squared minus straight x subscript 1 squared right parenthesis