Body B weighs 440 N and body A weighs 140N. The coefficients of friction between B and the incline are Us = 0.56 and Uk = 0.25.(adsbygoogle = window.adsbygoogle || []).push({});

a) Find the acceleration of the system if B is initially at rest

b) Find the acceleration of the system if B is moving up the incline

c) Find the acceleration of the system if B is moving down the incline.

(diagram: mass B is on the incline, and a is hanging)

For a, my teacher showed us the following solution:

a) mass b (g)(sin theta) ?> mass a (g)

a = ((mass b)(g sin theta) - (mass a)(g) - Ffriction) / (mass B + mass A)

= 0

Could someone explain this solution to me? I think I will be able to figure out parts b and c once i understand part a.

Thanks in advance and sorry I couldn't scan the diagram.

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# Homework Help: Grade 12 physics - one mass on incline and other hanging

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