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(1I) Calculate the average speed and average velocity of acomplete round trip in which the outgoing 250 $\mathrm{km}$ iscovered at 95 $\mathrm{km} / \mathrm{h}$ , followed by a 1.0 -h lunch break, andthe return 250 $\mathrm{km}$ is covered at 55 $\mathrm{km} / \mathrm{h}$ .
a. $61 \mathrm{km} / \mathrm{h}$b. $\bar{v}=\Delta x / \Delta t=0$
Physics 101 Mechanics
Chapter 2
Describing Motion: Kinematics in One Dimension
Physics Basics
Motion Along a Straight Line
Motion in 2d or 3d
Newton's Laws of Motion
Rutgers, The State University of New Jersey
University of Sheffield
University of Winnipeg
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So here we know that the, um for party we want to find the average speed. We know that the total distance traveled is going to be 500 kilometers and then we just simply need to find the total times The total distance traveled equals 500 kilometers. And then we can say that going there we can save the average speed or the average velocity would be equal to delta X of one divided by delta t someone we can solve For delta tease of one, this would be equal to delta X of one, of course, divided by the average velocity in the first portion of the trip. This is equaling 250 kilometres divided by 95 kilometers per hour. So this is giving us 2.632 hours for the second time. Delta T's up to this would equals Delta, except to which is again 250 kilometres on, divided by the east average velocity in the second portion. So this would be 250 kilometers divided by 55 kilometers per hour and this is giving us 4.5 for five hours Now There's a one hour lunch break so the delta T total would be equal to 4.545 Plus, what do you say for 4.545 plus 2.632 plus one So one hour lunch break and this is giving us 8.177 hours. So to find the average speed, this would be equal to Delta X Total divided by doubt the tee total and this would go 500 kilometers divided by 8.177 hours, giving us approximately 61 kilometers per hour. And then to find the for part B, we want to find the average velocity. However, the average velocity here, um, this is a round trip. So when you're when you're travelling round trip, you were you are ending up in the same place as you started. So your displacement, which defines velocity, will actually be zero. So if your displacement a zero your average velocity for the entire round trip would, of course be able to zero meters per second. That is the end of the solution. Thank you for watching
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