What two quantities must stay the same in order for an object to have a constant velocity? A) The speed and kinetic energy must
be constant. B) The speed and mass of the object must be constant. C) The speed and direction of travel must be constant. D) The force applied to and direction of travel must be constant.
The body senses whether it is upright or lying down or whether it is moving or standing still through the vestibular system, which is in the upper portion of the inner ear.
