Can cause a stationary object to start moving or moving object to change its speed or direction or both

Which transition by an electron will release the greatest amount of energy? oa ob oc od

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.