오늘은 난이도가 약간 있는 듣기에 도전해 봅니다. Challenge is the best way to improve a skill...!
Ok here I’m gonna
show you how to make predictions with a graph.
Let’s just say that his graph represents the altitude of a rocket as a
function of time. So at one second, the
rocket is at one hundred feet of altitude, two seconds at two hundred feet and
so on. Using the data points that we
already have, we can try to make predictions of the future height of the rocket as a
function of time.
So what I have done here is assume that the height varies linearly, which means for every one second of time elapsed the rocket will increase its height by one hundred feet. Since my data only goes up to four seconds, if I want to predict the height of my rocket after five seconds, I will have to assume that the rocket will increase its height by one hundred feet every additional second. So I predict that after five seconds I will have increased my height by another one hundred feet to make five hundred, and if I want to further predict six, seven, eight, nine seconds, I will increase my height by one hundred feet for every additional second that I wanna predict. And we need to be careful about how accurate we are with our predictions in assuming that it’s hundred feet for every second.
Using this method, I can find out the altitude of the rocket after five, six, seven, eight how ever many seconds I want. By using the rule of increase of one hundred feet per every second, this way, I can find the value of the height even beyond the data that I’ve evaluated.