1. the stopping distance, d, in feet of a car is directly proportional to
the square of its speed, v.

a- write the direct variation equation for the scenario above.

b- when there is a car accident, it is important to figure out how
fast the cars involved were traveling. using the direct variation
equation above, solve for speed.

A: The variation equation is

B: The speed is

Step-by-step explanation:

Part A:

The stopping distance is directly proportional to the square of the speed. Mathematically this means the distance is equal to the square of speed multiplied by a proportionality constant , thus

Part B:

Once we have the equation relating and , then it is easy to solve for using that equation.

Rearranging the equation we got in Part A and solving for we get:

d is correct

step-by-step explanation: