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A small \( \operatorname{disc} A \) is placed on an inclined plane forming an angle \( \alpha \) with the horizontal and is imparted an initial velocity
\( \mathrm{P} \) \( v_{0} \). Find how the velocity of the disc depends on the angle \( \theta \), shown in figure-2.209, if the friction coefficient \( \mu=\tan \alpha \) and at
W the initial moment \( \theta=\pi / 2 \).
Figure 2.209
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