Solution of task 11.2.21 from the collection of Kepe OE
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11.2.21
The ABCD plate rotates about the Oz axis with an angular velocity ω = 4t. On its side BC in the direction from B to C moves point M with a constant speed of 9 m / s. Determine the modulus of the absolute velocity of the point M at time t = 3 s, if the length of AB = 1 m. (Answer 15)