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m = 3 kg
F = 15 N
ditanyakan :
a=?
a dg gaya gesek = ?
jawab :
a)
F = m a
15 = 3a
a = 5 m/s²
b)
F - fr = m a
15 - 3 = 3a
12 = 3a
a = 4 m/s²