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v1 = v2 = 4 m/s
α = 60
dit : R ?
dijawab :
R = √(4²+4² + 2x4x4xcos 60)
= √(16+16 + 2x4x4 x 1/2)
= √(32 + 16)
= √48
= √16x3
= 4√3 m/s