Final answer:
An object in uniform circular motion is accelerating because its velocity is constantly changing direction. The correct answer is option 1.
Step-by-step explanation:
In uniform circular motion, an object is constantly changing direction as it travels along a circular path. Although the speed of the object remains constant, it experiences a changing velocity because velocity is a vector quantity that includes both magnitude and direction. Therefore, an object in uniform circular motion is accelerating.
The acceleration of an object in uniform circular motion is called centripetal acceleration. It is always directed towards the center of the circular path and its magnitude can be calculated using the formula:
a = v² / r
where a is centripetal acceleration, v is the velocity of the object, and r is the radius of the circular path.