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4. A student in a mall walks 140 m [E] in 55 s to go to his favourite store. The store is not open yet,

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4. A student in a mall walks 140 m [E] in 55 s to go to his favourite store. The store is not open yet, so he walks 45 m [W] in 21 s to go to another store. Calculate his (a) average speed [ans: 2.4 m/s] (b) average velocity [ans: 1.2 m/s [El]

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