# Work and force

by chocolatelover
Tags: force, work
 P: 1,017 No, its not right. You've almost hit it. You know $$F=kx$$ Now, you know 25N force is required to hold it at 30 cm. Plug these values in and find k from here. Be careful about the unit and convert everything to SI before plugging the values in. The second part asks you to find the work done, you know $$W=\int F(x)dx$$. This gives you $$W=\frac{1}{2}kx^2$$ Apply the limits as you did, and use the value of k found above, and you have your answer.