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A = 18 m/s
B = 24 m/s
R = 6 m/s
sudut α =?
R^2 = A^2 + B^2 + (2.A.B.cos α)
6^2 = 18^2 + 24^2 +( 2.18.24.cos α)
36 = 324 + 576 + ( 864 cos α)
36 = 900 + ( 864 cos α )
cos α = 36 - 900 / 864
cos α = -1
α = 180
maka sudut apitnya 180 derajat
semoga membantu 6_^