Well I think something like this may have been posted like this a while ago but if I remember this is a little different.

The formula is h=vt - 16t^2 where h is height v is velocity and t is time. The 16t^2 is accounting for the gravity, as cleared up by rcman.

I know there's programs out there mainly the ones by d_hall but they are just estimates and don't account for some environmental factors although this equation doesn't account for anything it could be added in.

The main reasons I posted this is can you can find out the maximum height of a projectile and when it will get there. That may be useful for some things that can't be discussed here.

Really you just rearrange the equation to your liking to solve for your variable that you want to know. It's basic 8th grade math...

If you need help just ask.

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