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brake4country
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Homework Statement
A 10 kg mass is on a frictionless inclined plane 30 degrees to the horizontal. At the top of the plane is a pulley that has a rope attached to mass with tension T = 75 N. If the mass starts from rest, what is its velocity after 2 seconds?
Homework Equations
F = ma
Vf=Vi + at
The Attempt at a Solution
So my book lists the formula as T = mgsinθ + ma. I set the problem up pretty much the same as:
∑Fx = max
75 N - 10 N = (10 kg) a
My acceleration is 6.5 m/s2. Plugging this value into vf=vi + at, I get 13.0 m/s but my book says it's supposed to be 5 m/s. What am I doing wrong? Thanks in advance!