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Mercury rotates at a speed of 11 km/h. Therefore the circumference of Mercury is approximately 1) 1 550 km. 2) 9 200 km. 3) 12 100 km. 4) 15 600 km.
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i think we will be needing time period of rotation of mercury.
also you need to tell which part of mercury (distance from centre and angle with equator) is travelling with this speed since linear speed is different for different parts
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