Answer:
-5.06 m/s
Explanation:
The formula to calculate average speed is
V = x2 - x1 / t2 - t1
The start point of the tumbleweed is 25.6m and the final point is -14.4 m
The start time is 0s and the final time is 7.9s
Replacing the values the result is -5.06m/s.
The result of the speed is negative because the direction of the speed is opposite to the direction of the tumbleweed.