# Launge a spring on a inclinded plane in a bucket?

1. Apr 22, 2010

### ajkly

launge a spring on a inclinded plane in a bucket??

1. The problem statement, all variables and given/known data
ok im ask to find the length i have to pull on the spring hooked to the edge of a inclinded plane and release it to shoot the spring in to the bucket. anyoen have any idea how to do it??

2. Relevant equations
i had worked out some of the possible solusions..
range formula = ((v^2)/fg)sin2(theata)
rearragne for V
V= root [ (R)(fg)/sin2theata ] - eq'n 1
Fnet = Fa - (Ff + fg sin theata), inclinded plane equations
Fa = Ee (elastic energy of the spring)
Ee = 1/2 K X^2 , K= spring constant, X = the length which the spring is being stretched and its the thign i want to find
sub Ee = Fa = 1/2 Kx^2 in to Fnet equation
Fnet = 1/2 kx^2 -fg (fg cos theata mUK (friction coeificent) + fg sin theata)
EK = 1/2 m v^2
EK = F d cos theata
equate them together
1/2 m v^2 = F d cos theata , assuming d = length of inclinded plane
than sub in equation V and equation Fnet as F in to 1/2 m v^2 = F d cos theata then
rearrange for X which is the length which i have to pull to fire the spring in to the bucket

3. The attempt at a solution
i kinda type attempt at solution up there ...sry..

so yea after i rearrange for x and put in possible values for all variables...the answer doesnt seem to be .... realistic enough to believe....coz i cant do the lab now at home...coz i dont have the materals...but my lab is tmr... anyone got any idea??
thx =]