Answer:
E
Step-by-step explanation:
57 - 36 = 21 6 - 4 = 2 seconds
21 ÷ 2 = 10.5
Answer:
The average speed of runner is given by option d) 10.5 meters per second.
Step-by-step explanation:
We are given the following information in the question:
A runner’s time was 4 seconds at the 36-meter mark.
A runner’s time was 6 seconds at the 57-meter mark.
Formula:
[tex]\text{Average speed} = \displaystyle\frac{y_2-y_1}{x_2-x_1}\\\\\text{where}, y_2, y_1 \text{are the distances at time} x_2, x_1 \text{respectively.}[/tex]
Putting the given values in the question, we have:
[tex]\text{Average speed} = \displaystyle\frac{57-36}{6-4} = \frac{21}{2} = 10.5\text{ meter per second}[/tex]
Hence, the average speed of runner is given by option d) 10.5 meters per second.
