The center of mass of the 12-kg object moves in the x–y plane. Its polar coordinates are g...

The center of mass of the 12-kg object moves in the x–y plane. Its polar coordinates are given as functions of time by r = 12 – 0.4t2 m, θ = 0.02t3.1 rad. Determine the polar components of the total force acting on the object at t = 2 s.