Question

I have a few basic physics problems.

How do you calculate how long it will take for an object to hit the ground when it is dropped from a certain height? Specifically from 128 ft.

Additionally how would you calculate how much velocity is needed to launch at item to a certain height? Specifically from 64 ft.

Thanks :)

Answer 1

What do you think first

Answer 2

Well, for the first I was trying to use V(t)=g(t)+v(0), but I can't figure out of v(t) would be zero because it hit the ground or if I need to figure it out some other way.

The second one I think is probably the same as figuring out what velocity it is when you drop it from 64ft. That's as far as I got.