Which of the following statements is accurate?
a. if an object's velocity remains constant, its acceleration must be increasing.

b. if an object's velocity is changing, it's either experiencing acceleration or deceleration.

c. if an object's velocity decreases, then the object is accelerating.

d. if an object is said to be decelerating, its velocity must be increasing

B. If an object's velocity is changing,it's either experiencing acceleration or deceleration.

Acceleration is defined as the rate at which an object changes its velocity. This implies that if an object is changing it's velocity it is experiencing acceleration/ deceleration.

Acceleration is a vector quantity that has both a magnitude and time.

It is represented as

Acceleration= change in velocity/time.

The SI unit for acceleration is m/s^2

this could be newton#'s law of cooling. the cooling curve is exponential