Question
A box with a mass of 2.0 kg rests on one end of a seesaw. The seesaw is 6.0 m long, and we can assume it has negligible mass. Approximately what angular momentum will the box have if someone with a mass of 65 kg sits on the other end of the seesaw quickly, with a velocity of 1.2 m/s?
1. 702 $\textrm{ kg} \cdot \textrm{m}^2 \textrm{/s}$
2. 39 $\textrm{ kg} \cdot \textrm{m}^2 \textrm{/s}$
3. 18 $\textrm{ kg} \cdot \textrm{m}^2 \textrm{/s}$
4. 1.2 $\textrm{ kg} \cdot \textrm{m}^2 \textrm{/s}$

(e), since none of the options are correct. See video for explanation.

Solution Video