Question

An elastic spring of unstretched length `L` and force constant `K` is stretched by amoun t `x` .It is further stretched by another length `y` The work done in the second streaching is
A. `(1)/(2)Ky^(2)`
B. `(1)/(2)K(x^(2) + y^(2))`
C. `(1)/(2)K(x+ y)^(2))`
D. `(1)/(2)Ky(2x+ y)`

Answer 1

Correct Answer - D
`W = (1)/(2)k(y + x)^(2) - x^(2)`