 ## Physics

Learn the toughest concepts covered in Physics with step-by-step video tutorials and practice problems by world-class tutors

2. 1D Motion / Kinematics

# Average Velocity

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concept

## Intro to Velocity and Speed 5m
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Problem

Beginning from a signpost, you run 60m to the right, then 60m back. The entire trip takes 24 seconds. What is your speed and velocity for the whole trip?

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concept

## Solving Constant and Average Velocity Problems 5m
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example

## Baseball Pitch 1m
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Hey, guys, let's check this problem out. We have a baseball pitcher who can throw a baseball at some speed. We're trying to figure out how long it takes for the baseball to travel the distance to the home plate. So let's just draw a quick little sketch. I've got a baseball like this, and I know that the velocity that this is thrown out is 44 m per second. Now. I'm not told that the baseball slows down, speed up or anything. So when this happens in problems, you can assume that this is a constant velocity. So it's a constant velocity that the baseball is traveling, and we know that the distance to the home plate, which is Delta X, is gonna be 18.5 m. So now the only thing we have to figure out is what's the time? So what is the time while we're working with constant velocity, which means we could only use one equation now, that equation, remember, is that the whoops that's the velocity is equal to Delta X over Delta T. And so what's the variable that I'm looking for? It is just delta T, so I could just re arrange for this really quickly so I could move this. These basically to the other side. I could swap the V and the Delta T. And what I get is the T is equal to Delta X, divided by the velocity. So that's just 18.5 divided by 44. And if you work that on your calculator, you're gonna get 0.42 seconds. So about half a second for the baseball to travel to the home plate. So for those of you baseball players out there, uh, this actually might make some sense to you. Alright, guys, that's it for this one. Let me know if you have any questions.
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concept

## Constant Velocity with Multiple Parts 7m
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Problem

You walk to the right at 3m/s for 8s, then turn around and walk backwards at 2m/s for some unknown time. You end up 16m to the right from where you started. How long did you walk backwards?

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example

## Race Against Time 5m
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