n a binary-star system, each star has the same mass which is 9times that of the Sun, and they revolve about theircommon center of mass. The distance between the stars is 6 times the distance between the Earth and the Sun. Whatis their period of revolution in Earth years

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

inverse v=i*r

nice nice