Acar moves around a circular track at a constant rate. what must change?
o a) only its speed
ob) only its velocity a
oc) both its speed and its velocity

A car moves around a circular track at a constant rate it's velocity changes.

Option-B.

Explanation:

As the car is moving in the circular motion, its velocity changes, as its speed is scalar and which means it is constant, velocity changes (being a vector quantity).

Its angular velocity is the speed in the direction of the curve the vehicle moves, which means it is constant, but is acted upon by an acceleration toward its center called centripetal acceleration and it is necessary to maintain the circular motion of the car.