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Newton’s 2nd Law, 2 Crates held by a Pulley

Two crate A and B are connected with a rope with negligible mass over a frictionless pulley as represented below. The crates are at rest. Crate A has an unknown mass and hangs vertically to the right of the slope and crate B with mass 22 kg, hangs on the slope to the left. The slope makes and angle of 67 degrees with the horizontal. The static coefficient of friction between crate B and the surface of the slope is 1.716. The frictional force is up the slope.”

The Answer is suppose to be 5.5Kg, but I don’t know how to get it.
Please Help

phys2

Asked Greg Sithole

 

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