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Mechanics equation
pedro Started conversation Dec 3, 2009
I know that a a 10kg weight has fallen 20m.
The potential energy gained is E=mgh = 10 *9.81 * 20 = 1962J
Using kinetic energy equation E = 1/2 mv^2, I can get v from this at 19.8m/s.
But how do I get v just from knowing the distance and ecceleration? Does anyone know the formula without having a pesky 't' in there somewhere?
Mechanics equation
pedro Posted Dec 3, 2009
ecceleration = acceleration obviously. Behold my mistake
Mechanics equation
sigsfried Posted Dec 3, 2009
v^2=u^2+2as
v is final velocity
u is initial velocity
a is acceleration
s is displacement.
I believe. Not 100% confident though.
Mechanics equation
Mu Beta Posted Dec 4, 2009
There are five classic motion equations. If you know two of them (usually the first two), you can derive the rest with simple substitution.
1) v = u + at
2) s = 1/2(u + v)t
3) s = ut + 1/2at^2
4) s = vt + 1/2at^2
5) v^2 = u^2 + 2as
B
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Mechanics equation
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