AP Physics 1 Multiple-Select Practice Question 1
If the acceleration of an object is not zero, then which of the following could be constant? Select two answers.
Correct Answer: AC
A, C If the acceleration is not zero, the velocity is changing (eliminate (D)). Since linear momentum is the product of mass and velocity, it cannot remain constant if the velocity is changing (eliminate (B)). The object's speed can be constant as shown by the example of uniform circular motion. The kinetic energy can be constant as well because kinetic energy is scalar and depends on speed.