You're at the roller-skating rink with a friend who weighs twice as much as you do. The two of you stand motionless in the middle of the rink so that your combined momentum is zero. You then push on one another and begin to roll apart. If your momentum is then 497 \( \mathrm{kg} \cdot \mathrm{m} / \mathrm{s} \) to the left, what is your friend's momentum?
\( \mathrm{p}_{\text {friend }}= \) \( \square \) \( \square \) to the right