A motorbike moves east at and then west at

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A motorbike moves 20 km20\,\text{km} east at 40 km h−140\,\text{km\,h}^{-1} and then 10 km10\,\text{km} west at 20 km h−120\,\text{km\,h}^{-1}. The magnitude of its average velocity for the whole journey is (a) 18.2 km h−118.2\,\text{km\,h}^{-1} (b) 10 km h−110\,\text{km\,h}^{-1} (c) 30 km h−130\,\text{km\,h}^{-1} (d) 20 km h−120\,\text{km\,h}^{-1}

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