Can anyone give me solution please.?
73. Block A, with weight 3w,slides down an inclined plane
S of slope angle 37 ° at a constant speed while plank B,
with weight w,rests on top of A.The plank is attached
by a cord to the walt.(a) Draw a diagram of all the forces
acting on block A. (b) If the coefficient of kinetic
friction is the same between A and B and between S and 
A,determine its value.

a   9 20         ( b )   1 5 c   3 4             ( d )   1 4

Easiest question.try you will surely get the answer.use nlm formula...
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Can anyone please give solution im not getting as i m a beginner
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