A train moves east at and then west at

PHYSICS · Single correct · CBSE · Physics · Motion · Motion

Problem

A train moves

150\,\text{km}

east at

75\,\text{km h}^{-1}

and then

90\,\text{km}

west at

45\,\text{km h}^{-1}

. What is the difference between its average speed and the magnitude of its average velocity for the whole motion? (a)

0\,\text{km h}^{-1}

(b)

30\,\text{km h}^{-1}

(c)

45\,\text{km h}^{-1}

(d)

60\,\text{km h}^{-1}

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