Question

Vehicle Stopping Distance Taking into account reaction time, the distance d(in feet) that a car
requires to come to a complete stop while traveling rmiles per hour is given by the function
d(r) = 6.97r – 90.39
(a) Express the speed r at which the car is traveling as a function of the distance d required to come to
a complete stop.
(b) Predict the speed that a car was traveling if the distance required to stop was 300 feet.

could someone tell me the steps of how to go about this

Answer 1

lol i thaught d(r) = 6.97r – 90.39 is the answer to part a XD

Answer 2

i have no idea. i don't even know where to start.

Answer 3

do you know how much marks is this question?

Answer 4

a good amount im sure. i think it's asking me to find r(d) maybe?

Answer 5

i can do that but it'll be like 1 mark haha

Answer 6

r(d) = (d +90.39)/6.97
all i did was rearrange the formulae

Answer 7

but is does help for part be so i guess we might be on the right track xD

Answer 8

r(300) = (300 + 90.39)/6.97
r(300) = 390.39/6.97
r(300) = 56.01mil per hr

Answer 9

that would be my answer to the question :)