(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A horizontal force F is exerted on a 20kg box to slide it up a 30 degree incline. The friction force retarding the motion is 80N. How large must F be if the acceleration of the moving box is to be .75 m/s^2?

2. Relevant equations

All the forces on the box in the x and y direction have to equal zero

F=ma

F-Ff-Fn = ma

3. The attempt at a solution

Using F-Ff-Fn,

F-80-20*9.8*sin(30) = 20*.75

F-178= 15

F= 193 N

Which isn't even close to what the answer is supposed to be, which is F=220 N

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# Homework Help: What is force if acceleration is .75? (inclined plane)

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