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How long after the time t_1 does the angular velocity of B have to be to equal A's?

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ok, here we go:

i know that i have to write expressions for the angular velocity of A and B as functions of time, and solve for t-t1???

For A, omega(t) = omega_0 + alpha(t) and

for B, omega(t) = 0.5 omega_0 + 2alpha(t-t_1)

so when i equate them and solve for t-t_1, i get something that is not the right answer!

please help :(