A man runs `100.5 m` in `10.3 sec`. Find his average speed up to appropriate significant figures.

Answer

`9.76 ms^(-1)`

Explanation

Average speed `= ("Distance travelled") /("Time taken") = (100.5 m)/( 10.3 s) = 9.757 m s^(-1)`
Note that the distance `100.5 m` has four significant figures but the time of `10.3 s` has only three . Thus , we round off the final resultto three significiant figures.
The average speed must be correctly expressed as `9.76 m s^(-1)`.