Which one of the following has exactly 3 significant figures

You will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. (refer to the walk-through video to locate the online lab within the online textbook).

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?

Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)