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**'The formula for calculating the breaking distance needed when traveling at a certain speed is d=x^2/20 + x, where x is the speed of the car and d is the stopping distance.**

Calculate the stopping distance required when a car traveling 20 mph, 40 mph, 60 mph, and 60 mph.

My answers are not coming up correct.

Can you explain each step in this problem so I can see what I am doing wrong?'

**Answer**

D = x^2/20 + x The square of x needs to be calculated before dividing by 20.

So for 40 D = 40^2 / 20 + 40 D = 1600 / 20 + 40 D = 800 + 40 D = 840 However, the results do not match the stopping distance data for cars, so I suspect that there are errors in the formula or they are stopping distances for a another vehicle.

##### Virtual Teaching Assistant: John B.

##### Question Level: Basic

##### Karma: Free

##### Upload Date: 5/31/2017

This 74 words question was answered by John B. on StudySoup on 5/31/2017. The question contains content related to Math Since its upload, it has received 55 views.