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

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

okay i have so many questions. but the big one here is: um wt..f is this mess? ?