Okay. Our questions says the motorcar is moving with the speed of 18 meters per 2d due southward at one moment and 27.five meters per second due east viii seconds afterward. Over this time interval, determine the magnitude and direction of a information technology's average velocity be its average acceleration and see what is its average speed. Hint. Tin you make up one's mind all of these from the data given? Okay. So, um, I write down here what we were given in the problem, which was that nosotros were given that one of the velocities which I call actually I should switch these around because it tells me that initially information technology's going minus eighteen meters per 2nd south, right, So we'll telephone call that the one. The one is eighteen minus 18 meters per 2nd. Southward south is the minus J lid directions that two minus 18 meters per second. Jay had direction so Five ii velocity. The 2nd velocity is 27.5 meters per 2nd due eastward, which I phone call the positive I have direction And so 27.5 meters per second. The I had direction and and then tea is 8.0 seconds. So maybe I should merely go ahead and depict out here. Sigrid were using. So typically, this would be northeast southwest. Just we're calling this farewell in this, Jay. Good. Now information technology asks us to a outset determine whether or not it's even possible to find the average velocity than be the boilerplate acceleration. So meet, it wants united states of america to find the boilerplate speed. Okay, but and then it says hint, Tin can these be done? Well, eh? The average velocity is deportation, divided by a last elapsed time. And since the displacement is not known, the average velocity cannot be determined, so a cannot exist determined. And then you can get ahead and write that for, eh? This great out whatever faster tin can exist determined. Okay, Now part be going to the average loss average dispatch while nosotros do. I know that this can be determined because the average dispatch would but call this a average hither, eh? A Sunday for average is equal to D change in velocity spectres divided by changing times and delta V Delta t. Okay, well, this is equal to Ah 27.5 minus minus xviii in ah, 0.0. And that's in D J. had direction. This is in the eye. Had management. Okay. And so all of this is divided by 8.0 which is the change in fourth dimension. That was elapsed. Minutes, seconds. Miss his meters per second. Okay, If y'all carry this out, you'll observe that 27.5 divided by eight is 3.44 class 3.four flooring in the eye had direction plus minus minus xviii which is plus eighteen divided by a 2.25 And that isn't the J had direction. The unit's here or meters per second squared since this is acceleration. Okay, that'due south the average. At present information technology also wants us to not just determine the average and wants u.s. to determine the magnitude and direction of this boilerplate value. Well, the magnitude of a boilerplate ace of a country right that says more eligible today is equal to the foursquare root of the square of the values that brand information technology upwardly. And so 3.44 squared plus 2.25 cool squared. Okay, y'all carry this out, you go 4.11 Who 0.11 and that's in meters per second squared since acceleration Okay, There's the magnitude. And now we also want to find the direction. Well, in society to exist able to detect this direction breaking news. Our trig identities for changing data is equal to the opposite over the side by side Don't sell me. Draw out the triangle that I'm talking about here. So this is a right 90. Today we but determine that. And this is Ace. Um, the Simply run across, this would be the J chapeau directions. This is a some J. And this is Thie. My hat direction. So this would be a skilful bye. Okay, And so contrary over side by side for this angle. Here, this is the angle nosotros desire to determine. This is data. Well, that's going to be ii.25 divided by 3.44 All right. And nosotros want to solve for theta. Then we solve. For theta, it is equal to the inverse tangent of 2.25 divided by 3.44 three points. Flooring 23 And if you carry that out, you lot'll find that the inverse tangent of 2.25 divided by iii.3 for iv is 33.ii degrees. Okay, well, and that is two in the jihad direction relative to the I had management. Well, Jay had, if you lot call up, was ah North represents north and south, And so it'southward in the positive J had direction. So information technology'due south in a positive n direction. And that's relative to the I had direction, which is east. So this is north of east. So this right north for in Oran for north and e for east so north of East box set in their direction. Okay. Then the very last thing we were asked to determine was the average speed, right? So C is the average speed. So nosotros will go ahead and, uh, get a new page here just for Parsi since we ran out of room on the other page. But withal, if you think, the hint was can you determine all of these to the first affair we demand to ask ourselves is can't even decide this. And the answer is no. Since the boilerplate speed is altitude travel divided by fourth dimension, the last and the distance traveled is non known. Nosotros unfortunately cannot determine this. Then even though we're not starting a new folio, there'southward null we can do here so we tin can write out. I cannot determined as our solution for Parsi. That's information technology
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