Question: A car merges onto a freeway, accelerating from (60 mathrm{~km} / mathrm{h}) to (80 mathrm{~km} / mathrm{h}). As it does this, a bus passes by

A car merges onto a freeway, accelerating from $60 \mathrm{~km} / \mathrm{h}$ to $80 \mathrm{~km} / \mathrm{h}$. As it does this, a bus passes by in the fast lane, travelling at a constant $100 \mathrm{~km} / \mathrm{h}$. Which vehicle has the greater magnitude of the vector sum of forces acting on it?

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