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I tried using torque= I* alpha

torque= L x f= (.57)(18.62)=10.6

I got from Newton's 2nd law, (9.8)(1.90)

so, 10.6 = I* alpha

I= (1/12)(mL^2)= (1/12)(1.90 * (.57)^2= .051

so, 10.6 = .051 alpha

alpha = 207.8 rad/s^2

alpha= a/L

207.8 = a / .57

a= 118.4 m/s ^2

This isn't right... can someone please help me?