True or false? a model train traveling at a constant speed around a circular track has a constant velocity.
(false) 2.which of the following would be affected if a soaring eagle changed direction but remained at a constant speed?
acceleration only velocity only acceleration and velocity (i picked this) neither

For both, remember that velocity is a vector force, meaning that it has both a magnitude and direction. Since direction is part of the vector, if the direction changes so does the velocity in general. The changing of velocity is acceleration, so for 1 the answer is False.
For 2 I'm not sure what you meant, but the answer is the acceleration changes but the velocity does not.

therefore, the efficiency is: