Deriving an equation?

1. Oct 1, 2012

jensgt

1. The problem statement, all variables and given/known data
Can you come up with (i.e. derive) equations 5-1 and 5-2 on your own using UAM equations? Try it

2. Relevant equations

This is the equation I need to end up at...

R=Vox/g(Voy+(Voy^+2gh)^1/2

3. The attempt at a solution

I am not really sure where to start. I was trying to use the equations for range and height but it does not seem to be getting me anywhere. This is my first physics course.

2. Oct 1, 2012

tiny-tim

welcome to pf!

hi jensgt! welcome to pf!

(try using the X2 button just above the Reply box )

don't try to memorise (or use) the range or height equations , go back to the standard constant acceleration equations, for the x and y directions (separately)

they'll use the same t …

show us what you get

3. Oct 1, 2012

jensgt

The equations I know are

Vx = Vox + Axt

X = Xo + Voxt + 1/2axt^2

X-Xo = [(Vox + Vx)/2]t

Vx^2 = Vox^2 +2ax(X-Xo)

I am just confused as to where to start. I derived the other one he asked us about this one has me stuck.

4. Oct 2, 2012

tiny-tim

hi jensgt!

(just got up :zzz:)
use x = xo + Vxot + 1/2axt2

and y = yo + Vyot + 1/2ayt2

(obviously, ax = 0) …

show us what you get

(btw, never use "x" for times, it's too confusing … use "*" instead, or nothing at all! )