Final answer:
Most things in motion are accelerating, so only a few things in real life move at a constant speed. Slowing down is a type of acceleration called deceleration.
Step-by-step explanation:
Most things in motion are accelerating, so the statement 'Most things in real life move at a constant speed' is false. In reality, few things move at a constant speed; instead, they either speed up or slow down over time.
Slowing down is a type of acceleration called deceleration. When an object slows down, its acceleration is opposite to the direction of its motion. For example, if a car is initially moving forward and then starts to slow down, its acceleration is in the opposite direction to its forward motion.