Posted by **annonomus** on Monday, October 11, 2010 at 4:48pm.

A person walks 3.0847x10^1 m East, then turns around and walks 8.677x10^0 m West. The total time to walk this distance was 7.8624x10^2 s. What is the speed of the walker, expressed to 3 significant figures?

please help me im so confused

- Physics -
**drwls**, Monday, October 11, 2010 at 5:05pm
Since the walker turns around and goes backmwards, subtract the second distance from the first. Then divide by the time for the AVERAGE velocity. They asked for average speed, which is something else. It would depend upon how much time was spend travelling at each speed.

They also fail to distinguish between average and instantaneous speed. The question was poorly phrased.

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