Question

10 seconds into a race, Clara was at the 25 meter mark. At 60 seconds into the race, she was at the 100 meter mark. What was the approximate rate of change in Clara's speed between 10 seconds and 60 seconds? A) .6 meters per second B) 1.5 meters per second C) 2 meters per second D) 7.5 meters per second

Answer 1

Answer:

B) 1.5 meters per second

Step-by-step explanation:

The rate of change in Clara's speed between 10 and 60 seconds can be calculate as:

$Speed =\frac{X_f-X_i}{t_f - t_i}$

Where $X_f$ is the mark at 60 seconds, $X_i$ is the mark at10 seconds,   $t_f$ is the 60 seconds and $t_i$ is 10 seconds.

Replacing values, we get:

$speed =\frac{100 meters- 25 meters}{60 second-10 second } =1.5 meters per second$

So, the speed between 10 and 60 seconds is 1.5 meters per second

Answer 2

B is the correct answer