Question: An (80-mathrm{kg}) physicist and a friend are ice-skating. The physicist, distracted, collides from behind at (7.0 mathrm{~m} / mathrm{s}) with his friend, who is skating

An $80-\mathrm{kg}$ physicist and a friend are ice-skating. The physicist, distracted, collides from behind at $7.0 \mathrm{~m} / \mathrm{s}$ with his friend, who is skating at $5.0 \mathrm{~m} / \mathrm{s}$ in the same direction. After the collision, the physicist continues in the same direction at $4.0 \mathrm{~m} / \mathrm{s}$, but his friend is now moving (still in the same direction) at $8.0 \mathrm{~m} / \mathrm{s}$. What is her inertia?

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