A 1.5-kg cart is pulled with a force of 7.3 N at an angle of 40 degrees above the horizontal. If a kinetic friction force of 3.2 N acts against the motion, the cart's acceleration along the horizontal surface will be?

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This is a simple balance of forces.\[\sum F = m*a = F - F_f\]

what is the F=? and Ff=?

i don't get it..

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