## 4 thoughts on “3.45”

1. Brad Robertson says:

For the spring force k5, why is the force k5(x2-x3) as opposed to k5(x1-x3)?

1. tutorpaul says:

I think I wrote $k_5(x_1 - x_3)$ or at least I intended to, but my handwriting faltered. Notice later in the problem I used that term correctly.