Practicing Success
A block attached to a spring, pulled by a constant horizontal force, is kept on a smooth surface as shown in figure. Initially, the spring is in the natural length state. The the maximum positive work that the applied force F can do is : (given that string does not break) |
\(\frac{2F^2}{k}\) \(\frac{F^2}{k}\) \(\frac{F^2}{2k}\) \(\infty\) |
\(\frac{2F^2}{k}\) |
Applying Work-Energy Theorem on the block, we get : \(Fl - \frac{1}{2}kl^2 = 0\) \(l = \frac{2F}{k}\) \(\text{Work done = } Fl = \frac{2F^2}{k}\) |