Abody travels 10 meters during the first 5 seconds of its travel, and it travels a total of 30 meters over the first 10 seconds of its travel. what is it
average speed during the time from t = 5 seconds to t = 10 seconds?
a.
2 meters/second
b.
3 meters/second
c.
4 meters/second
d.
5 meters/second
e.
6 meters/second

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

wavelength divides in half and speed stays the same.