Projectile height given time | One-dimensional motion | Physics | Khan Academy

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Figuring out how high a ball gets given how long it spends in the air. Created by Sal Khan.

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

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varsaljr

You are honestly a superhero, you have saved me on multiple occasions and I thank you!!!

minabanoub

I know these topics on the beginning of physics but I just cannot help myself watch these video. It is much better than my lecturers in high school, teaching algebraic based physics topic. I recall that period of time it was a disaster to have those lectures to teach.

BoZhaoengineering

All The Videos Of Khanacademy are really good.

sagartade

When you find the change of displacement in this video, do you mean the change of displacement in the x direction, or y direction?

kkay

The whole time I am thinking how you used a calculator on the screen.^_^

Muskantt

How much time will it take for it to come down? I am thinking the time down should be the same as up (when air resistance is neglected); but it would be nice to see the math/equations worked out

joeperrone

I have a question that I think is kind of like your video but I'm not sure . I have a air gun and I want to know how many feet per second the pellet is traveling at a distance of 30 feet using sound . Here is how I set it up . I put the end of the barrel at exactly 30 feet from the metal target . I used a program called Audacity , its a audio software program . I connected two mic's one was placed at the barrel of the gun and the other at the metal target . I shot the pellet and got a start sound and a end sound . In the program you can mark the start time of the sound and the end time my zooming in the sound and moving the sliders to the exact start of the sound and the exact 2nd sound . The time of travel turned out to be 0.040 seconds . So how do I go about figuring out how many feet per second the pellet was going in that 30 feet . The weight of the pellet is 7.9 grains if that matters .

Sertao

I know this video is super old now, but why do you have to use average velocity for finding displacement? you found the velocity going up, which is 24.5m/s, and if air resistance is negligible then the velocity should be the same coming down. So why not just plug in 24.5 for the velocity in the displacement equation, and 2.5 for the change in time? Then you would find the displacement going up, multiply that by 2, and you have final displacement. Am I thinking about this wrong?

CapitalRay_

How to calculate height in variable gravitational field

Naabenstadt

Do we need graphing calculators in AP Physics Mechanics

purvitantia

I prefer to just write it as 245/8 meters.
Fractions're nice.

Peter_

I'm not sure if this accurately pertains to what I was given. { you throw a paper clip 64 ft straight into the air, t seconds after doing so, the paper clip is s= 64t-16t^2 ft above your hand. } it asks how long does it take to reach max height and how high will it go. then it asks I imagine what the initial velocity is. and if thrown on the moon what would be its max height and how long ti would take to reach it. it gives the same parameters but different gravity which isn't shown just the hint that its thrown on the moon. i feel like this video is similar but I feel like I'm missing something because I have no idea.

LadyBloodOath

The way to think about this is: if it took the force of gravity 2.5 seconds to overpower the initial velocity...what was the initial velocity?" The force of gravity x 2.5 and boom...

sharronpeters