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m = 10 kg
F = 12 N
μk = 0,1
μs = 0,2
ditanyakan :
fr = ?
a = ?
jawab :
w - N = 0
N = w
N = m g
N = 10 x 10 = 100 N
fr statis
fr = μs x N = 0,2 x 100 = 20 N
karena fr lebih besar dari F maka benda diam gaya gesek yg bekerja adalah gaya gesek statis, gaya geseknya sebesar 12 N
a = 0 karena benda diam
jawabnya option B