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Earth's gravity @ sea level
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A stone falls from rest how fast is it falling after 10 seconds?
Speed = (acceleration) times (time)Acceleration = gravity = 9.8 meters (32.2 feet) per second2Speed = 10g = 98 meters (322 feet) per second
If the speed of an object changes from 121 meters per second to 98 meters per second during a time interval of 12 seconds what is the acceleration of the object?
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
If the speed of an object changes from 121 ms to 98 ms during a time interval of 12s what is the acceleration of the object?
Average acceleration during the time interval = (change on speed) / (time for the change) =(98 - 121) / (12) = -23/12 = negative (1 and 11/12) meters per second2
Why are the units for acceleration meters per second?
Acceleration is not measured in meters/second. Meters/second is a unit of speed. Since acceleration is defined as change of speed divided by time, the units are meters/second/second, usually written as meters/second2.
What is the unit of acceleration measured in kilometers per hour?
Kilometers per hour is used to measure speed, not acceleration. In SI, the acceleration is commonly measured in meters per square second.Kilometers per hour is used to measure speed, not acceleration. In SI, the acceleration is commonly measured in meters per square second.Kilometers per hour is used to measure speed, not acceleration. In SI, the acceleration is commonly measured in meters per square second.Kilometers per hour is used to measure speed, not acceleration. In SI, the acceleration is commonly measured in meters per square second.
