Question

Brooklyn's car is stopped at a red light. when the light changes, the car accelerates to 75 miles per hour in 15 seconds. what is the approximate rate of change in the miles per hour that brooklyn's car accelerated?

a.5 miles per hour per second
b.6 miles per hour per second
c.15 miles per hour per second
d.45 miles per hour per second

Answer 1

75/15= 5
So A 5 MPH per second

Answer 2

The correct option is A. 5 miles per hour per second

Explanation:

Brooklyn's car is stopped at a red light.

So, when the car stops the speed of the car = 0 miles/ hour

When the light changes, the car accelerates to 75 miles per hour in 15 seconds

And we need to find the approximate rate of change in the miles per hour that Brooklyn's car accelerated

⇒ The approximate rate of change in the miles per hour that Brooklyn's car accelerated is given by :

`(75)/(15)\text{ miles per hour in 1 second}\\\\\implies 5\text{ miles per hour in 1 second}`

Therefore, The correct option is A. 5 miles per hour per second