To know the location of a vehicle that ran out of gas after taking a zigzag route through the city, the quantity that would be most useful is the vehicle's displacement.
In physics, the term quantity refers to something that can be measured.
Displacement is a vector quantity. Displacement simply means distance covered in a specified direction.
Notice that we want to find out the location of the vehicle after it ran out of gas. In this case, we don't only need to know the distance covered by the vehicle but also the direction in which the distance was covered in order to enable us to track the vehicle.
Hence, we need to find out the vehicle's displacement.
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