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4b.2 A person walks first 10 meters at 36.9 South of East in 20 s, and then 20 meters at south direction in 30 s.

4b.2 A person walks first 10 meters at 36.9 South of East in 20 s, and then 20 meters at south direction in 30 s. Calculate: (a) the average speed, (b) magnitude of the average velocity. [Answer: (a) 0.6 m/s, (b) 0.544 m/s]

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