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bmoore509
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Homework Statement
A spring with a spring-constant 2.9 N/cm is compressed 34 cm and released. The 9 kg mass skids down the frictional incline of height 30 cm and inclined at a 24◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a distance of 0.8 m along the incline which has a coefficient of friction of 0.2.
What is the final velocity vf of the mass?
Answer in units of m/s.
k=2.9
d=34 cm
m= 9
h=30cm
theta=24
distance of friction = .8 meters
Coefficient of friction=.2
Homework Equations
N=mgcostheta
Ff=Nk
Us+Ug+Wnc=K
The Attempt at a Solution
So I was looking up similar problems and this is what someone was told to do and I tried it but it didn't work at all. Can you tell me where I went wrong?
N=(9)(9.8)(cos24)=82.57
Ff=Nk=233.67
Us+Ug+wnc=K
.5kx^2+mgh+Ff(df)=.5mv^2
v=31.65
Which wasn't right.