E. The object’s average speed during the time interval from 1 s to 3 s is 13.5 ft/s.
B. An estimate of the object’s instantaneous speed at t = 3 seconds is 5.4 m/s.
What is average speed?
The average speed of an object is the ratio of total distance traveled by object to the total time of motion of the object.
position of the object at 1 second = 2.7 ft
position of the object at 3 seconds = 24.3 ft
total distance traveled by the object = 2.7 ft + 24.3 ft = 27 ft
total time = 3 - 1 = 2 seconds
average speed = 27 ft / 2 s
average speed = 13.5 ft/s
What is instantaneous speed?
This is the speed of the object at a specified time.
speed = distance/time
speed at 3 seconds = 16.2 m / 3 s
speed = 5.4 m/s
Thus, the object’s average speed during the time interval from 1 s to 3 s is 13.5 ft/s.
An estimate of the object’s instantaneous speed at t = 3 seconds is 5.4 m/s.
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