Solution of task 7.9.9 from the collection of Kepe OE
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7.9.9
The point moves in the plane. The equation of the polar angle? = 0.3t. Determine the polar radius r at the time when the polar angle reaches 3 rad, if dr / dt = 0.4 m / s. At t0 = 0, the radius r0 = 0. (Answer 4)