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You jog at 9 km/h for 5. km then you jump into car and drive an additional 19 KIPart AWith what average speed must you drive your car ilf your average speed for Ine...

Question

You jog at 9 km/h for 5. km then you jump into car and drive an additional 19 KIPart AWith what average speed must you drive your car ilf your average speed for Ine entire 24 kmn is to be 25 km/h?Express your answer using two significant figures

You jog at 9 km/h for 5. km then you jump into car and drive an additional 19 KI Part A With what average speed must you drive your car ilf your average speed for Ine entire 24 kmn is to be 25 km/h? Express your answer using two significant figures



Answers

$. .$ You jog at 9.1 $\mathrm{km} / \mathrm{h}$ for 5.0 $\mathrm{km}$ , then you jump into a car and
drive an additional 13 $\mathrm{km}$ . With what average speed must you
drive your car if your average speed for the entire 18 $\mathrm{km}$ is to be
25 $\mathrm{km} / \mathrm{h}$ ?

So in problem 16 we have a movement divided in two parts. The first part. We have a velocity of 9.1 kilometers per hour. Recover a distance of five. Hello, mentors. The second part, we drive in cover a distance of 13 kilometers. But we don't have the velocity. No. So the problem wants to know the velocity of the second part, knowing that the total average velocity is going was 25 kilometers per hour. Well, we know how to calculate average velocity. So the average velocity of the second part is going to be they space week over in the second part, divided by the time we spent to cover this space. The problem is, we don't have this time. So how we going to do to find this time? We can use the total time, then discovered it's time for the second part. That's CDs we know, thinking about home movement. We know that average velocity was 25. We know that the total space was 18. So the total time it's going to be t course 18 divided by 25. This sissy quotes too suitable 0.7 two hours. Okay. And what was the time For the first part, we know the velocity we jog. We know the distance recover. So this time, for the first part, just going to be Oh, it's C five divided by 9.1. This is it. Close to 0.55 hours. Okay, so what was the time For the second part? The time for the second part is just total time, minus the time for the first part. So this time for the second part is just zero point seven to minors. 0.55 That's it's close to 0.17 hours. Okay, well, we have the time for the second part so we can come back here and finish. The problem is just the average velocity is going to be 13 divided by 0.17. Let's see if close to 76 0.4 kilometers per hour. That's the final answer. Thank you for watching

The jogging. Hey, in months, Yes, 9.5. Or and the German distance. Expand it. The total distance exits Antico limit. And there is he next 22? Yeah. Therefore, the total Tired ST is your nights The drop in distance, Carol, By the way, you speak all the time? 24 from people? Yeah. Yeah, that Their companions 1.9 ups the distance covered. The car explained Excuse X minus. Excellent. I experience 24. My best eight monitor. Excluding 16 1. The time spending jogging time and jogging J one news expert upon even, uh, even legal 9.5, remember, are the ones 7.84 are now the time spent on the car that is keen to is my bestie one 42 is Yeah, young 0.9 US or treaty? Yeah, fine. Five. Oh, this needed to ca to speak of the car. It would need to Is the distance traveled by the car That it still from the times where the car is key to of the two distance seven days 16 and the two days 0.25 uh, of the skill of Takata. It's people kilometers. What

In part we need to calculate the average speed, the average speed. This is equal to distance table. We had a great time taken. So the distance civil is the difference between the meter reading. So it will be close to 124, minus 12 If I have to you worried where I am taken, The time taken is two hours. So it will be equals two 16 4 divided by two. It is equal to I did too. You learned with the but our So this is the average speed. In part B. We need to calculate, we need to calculate the velocity. The velocity is equal to displacement divided by time taken. So here since the car is starts from from from a point and returns again to the same point, so displacement is equal to zero divided by time taken. So the last will come out with zero.


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