The distance around the Sun must be 2PI*radius. Change that to meters.
The time to go around is 248 years. Change that to seconds.
speed= distance/time
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2*PI*5890E6 km/248years in m/s
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The planet pluto travels once around the sun every 248 years at a mena distance from the sun of 5890x10^6 km. Find its orbital speed around the sun in (m/s).
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