Yes, well, this means 2 things to me:
That the answer is (1/2)kx^2, because that's the energy I put into it (which I can't find - I don't know k, and I also don't know how far the spring got compressed [aka x]).
Or, we use the law of conservation of energy so that:
K + U = 0
K_f - K_i +...
Homework Statement
I did a lab today in Physics in which we launched ball from a spring loaded cannon directly into a pendulum that captured the ball, held it, and swung upwards with it (representing a totally inelastic collision). One question that confuses me:
> How much work did you do...