1 mile = 1.609 km = 1609 meter
9.81 meters/second/second = 9.81/1609 miles/second 2
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66.6 mph = 29.77 meters per second.
1 mile per hour = 0.44704 meters per second.
1 mph = 0.44704 meters per second so just multiply miles by 0.44704 to get meters per second: 30mph x 0.44704 = 13.4112 meters per second.
Use this conversion: miles per second x 1,609.344 = meters per second.
(150 miles/day) x (1,609.344 meters/mile) x (1 day/86,400 seconds) = 2.794 meters per second