Solution of task 15.2.6 from the collection of Kepe OE

Solution of task 15.2.6 from the collection of Kepe OE

15.2.6
On a horizontal platform, at a constant distance R = 1 m from the axis of rotation with a relative velocity vr = 3 m / s, a material point with mass m = 0.2 kg moves. Find its kinetic energy if the platform rotates with angular velocity? = 2 rad / s. (Answer 2.5)