Solution of task 11.2.21 from the collection of Kepe OE

Solution of task 11.2.21 from the collection of Kepe OE

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)