Three uniform objects are located in x-y plane. A 10 kg rod of length 30 cm has its center located at x = 50cm. A 2kg spherical ball metal of radius 8cm has its center located at x = -50 cm. A spherical volleyball of 1 kg mass and 10cm radius has its center located at y =-30cm. The x- and y-coordinates of the center of mass of the three objects are:

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

The correct answer is antinodes