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Hi.
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In this video we're going to answer some questions about acceleration, speed, and distance.
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So we're given that a plane, sorry, needs to accelerate to a speed of k, for some number k, which it can do in 30 seconds, and it needs to reach the speed in order to take off.
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And it has some constant acceleration.
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So what we need to do is figure out acceleration, velocity, and distance in terms of k.
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So we know that in 30 seconds, or i should start with, let's just say a of t, the acceleration is some constant a, which we don't know.
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Then because the initial velocity is zero, v of t is just going to be a times t.
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And one thing we know is that after 30 seconds, v of 30 should be at least k.
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In our case, let's just say it's equal to k.
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So it must reach k miles per hour after 30 seconds.
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So we know that 30a equals k...