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Q. A train at a constant 75 km/h moves east for 48 min, then in a direction 61.0° east of due north for 11min, and then west for 67 min. What are (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of its average velocity during this trip?

Q. The Earth is approximately a sphere of radius 6.37 million meters. What is its circumference in kilometres? And what is its volume in cubic kilometres?

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