University of Delaware

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Problem 72

Acceleration Assume that a fully loaded plane starting from rest has a constant acceleration while moving down a runway. The plane requires 0.7 mile of runway and a speed of 160 miles per hour in order to lift off. What is the plane's acceleration?

Answer

$$

7.45 \mathrm{ft} / \mathrm{s}^{2}

$$

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## Discussion

## Video Transcript

So we have nothing of thine minus zero. They want today two, but clean start from left. So this zero Now we know that in position. Play on time. T isthe 1/2 no t squared. Plus the initial velocity. Times two plus the initial position of the planes. We know that the planes Frenchman resting. And so this is your own and started zero miles. So this is your thiss is 1/2 continue times two. No, the runway is playing seven miles long, and that's equal to 1/2 t, which is brilliant, which is 160 miles per hour times t. So that means that 0.7 zero two, Which tells us t Okay. Sorry, people 2.7 divide it. But he we know. Hey, if you could tell me a tea delighted by team from this equation. So that is 160 divided by 0.7 painting to think what to one sixteen 16 times Anything divided by all right. Divided by 27 it's miles Tower Square sense

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