March 29, 2017

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Block M (mass of 15.65 kg)
is initially moving to the left with a speed of 3.77 m/s. The mass of m is 8.26 kg and the coefficients of friction are Us = 0.411 and Uk = 0.304. The string is massless and the pulley is
massless and frictionless. How fast will M be traveling when m has fallen through a height h = 2.47 meters?

W=change in E
This is what I have done:
I then solved for for vf. The answer is suppose to be 4.62 but I am way off. I need help fixing my set up.

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