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woopycushion
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Homework Statement
A 20.0g object is placed against the free end of a spring (k = 25.0 N/m) that is compressed 10cm. Once released, the object slides 1.25m across the tabletop and eventually lands 1.60m from the edge of the table on the floor. Is there friction between the object and the tabletop? If there is, what is the coefficient of kinetic friction? The sliding distance on the tabletop includes the 10cm compression of the spring, and the tabletop is 1.00m above the floor level.
Homework Equations
U(x)=(1/2)kx^2
F=-kx
W=fd
f=umg
F=umgd
The Attempt at a Solution
d=(1.6-1.25) = .35m
U(x) = (1/2)(25)(.35^2)