That is the acceleration of gravity on Earth.
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If you're looking to convert meters per second to miles per hour, 1m/s is approximately 2.2mph. So 98m/s would be about 219mph. See the links below for step-by-step instructions.
b. -1.92 m/s2Minutes per second is not a unit of velocity. If the question meant meters per second, the answer is correct.
Speed = (acceleration) times (time)Acceleration = gravity = 9.8 meters (32.2 feet) per second2Speed = 10g = 98 meters (322 feet) per second
Acceleration = change in velocity/time a = (v - u) /t where a= acceleration, v= velocity, u= initial velocity & t= time. u = 121 m/s v = 98 m/s t = 12 m/s a = (98 - 121) /12 a = -23/12 a = -1.91667 m/s2
30 meters is about 98 feet 5.1 inches tall.