Answer:
C. 4 meters/second
Explanation:
Average speed is the distance covered by an object divided by the required time use to travel that distance. Average speed is a scalar quantity because it has only magnitude.
Mathematically, it can be represented as
Average speed = Distance / time
From the question you are ask to calculate the average speed during the time from t = 5 seconds to t = 10 seconds.
This simply means you calculate for the time and distance difference of the travels. To put it in a simple manner the question want you to calculate the average speed for the last 20 m.
Distance covered from t = 5 seconds to t = 10 seconds is 30 - 10 = 20 m
Time used from t = 5 secs to t = 10 secs is 10 - 5 = 5 secs
Average speed = 20/5 = 4m/s
4m/s is the average speed for the time difference of 5 secs
