Question

Select the correct answer.
A body 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
its average speed during the time from t = 5 seconds to t = 10 seconds?
A 2 meters/second
B. 3 meters/second
C4 meters/second
D. 5 meters/second
E. 6 meters/second

Answer 1

Answer:

C. Average Speed = 4 m/s

Explanation:

Average speed is defined as total  distance travelled per unit time taken

$average speed = \frac{total\ distance\ travelled}{total\ time\ taken}$

From $t_{1}$ = 5s to $t_{2}$ = 10 s

Total time = 10 -5 = 5s

Distance travelled in first 5s= $s_{1}$  = 10 m

Distance travelled in first 10s = $s_{2}$ 30 m

Total distance between 5 s- 10 s = 30 - 10 = 20 m

$average speed = \frac{20}{5}$

$average speed = 4 m/s$

!! Please look at the attached image