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Velocidad tangencial =Vt = 13m/s
Radio R= 22cm = 0.22m
Tiempo T = 12s
Aceleración angular α =?
Primero hallamos la velocidad angular ω
Vt = Va ×R
13m/s = Va ×0.22m
13m/s / 0.22m = Va
59.1 rad/s = ω
Ahora si hallamos aceleración angular
α =ω /T
α = 59.1 rad/s / 12s
α = 4.9rad/s²