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yang C .6 sekon jawabannya
Jenis gerak B =======> GLB dengan V = 10 m/s
Jenis gerak A =======> GLBB dengan percepatan a = tan α = 10 / 3 = 3,3 m/s
Vb.t = Voa.t + 1/2 . a.t^2
10 .t = 0 .t + 1/2 . 3,3 . t^2
10.t = 1,65 t^2
1,65 t^2 - 10 t = 0 =========dibagi 1,65
t^2 - 6t = 0
t( t - 6 ) = 0
t = 6 sekon
semoga membantu