Which object has unbalanced forces acting on it?

A. an airplane flying at 225 m/s

B. a car accelerating at 4.5 m/s 2

C. a dog running at 1 m/s

D. a windmill blade spinning at 50 m/s

Please provide an explanation, it can be short.

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.

What formula  this one  (x_/