Physics

Problem

A spring has a spring constant of

0.25\,\text{N\,cm}^{-1}

. a. (i) Express the spring constant in

\text{N\,m}^{-1}

. b. (ii) The spring is stretched by

8\,\text{cm}

. Calculate the energy stored in the spring. c. (iii) By how much must this spring be stretched so that the energy stored in it becomes

0.80\,\text{J}

? Show all steps clearly.