14.1.17
Determine the projection of the acceleration of the center of mass C of the mechanical system on the Oy axis at the time when the coordinate yC = 0.8 m, if the mass of the system is m = 10 kg, and the principal vector of the applied external forces is Re = 3i + 6tj. At the initial time, the center of mass of the system was at the point O at rest. (Answer 1.2)