How did you arrive at 8 m/s²?
The object does not seem to have changed velocity at all (although we do not know what the variatioins are during the 1 second intervals).
An object travels 6m in the first second of travel, 6m again durning the second second of travel, and 6m again druning the third second. It acceleration in meters per second per second(M/S2) is
2 answers
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