*gasp* I got it! All the formulas having no mass means I can kick that part out.
The velocity at the start is zero (why didn't I think of that earlier?!)
Thus it becomes:
(9.8*1.5) + (.5 (0^2)) = (9.8*0.5) + (.5 (v^2))
14.7 = 4.9 + .5*v^2
9.8 = v^2 and thus v=4.4
And...
thus potential energy is found by m*g*h and kinetic is .5*m*v^2 (velocity squared). Correct?
Or do I use this other formula for Kinetic? E=p^2/2m ?
where p is the momentum?
I'm sorry for being dense I am trying to pull this all in.
bu tI ended up getting:
(x*9.8*1.5)+ (.5*y^2)...
And yet, that seems to be my problem because for each formula for both kinetic and potential energy that I find I have to have the mass of the object, and yet the question mentions nowhere in it the mass of the toy car. This is what I keep bumping into while trying to find an answer to this...
:cry:
I need a bit of help finding a good source to use to help solve these problems. I am taking a test that is 20% physics (20% chem and the rest are life sciences) and I have not taken physics in over five years. I've been browsing through the internet for over two hours now and the best...