A spring of force constant k is cut in two parts at its one-third lingth. When both the parts are stretched by same amount. The word done in the two parts will be .

Options

A. equal in both
B. greater for the longer part
C. greater for the shorter for the shorter part
D. data insufficient.

Answer

C

Explanation

`kprop1/l`
l of shorter part is less, therefore value of k is more,
`W =(1)/(2)kx^(2)`
`:. W^("shorter part")` will be more.