Which of the following is an example of an object that is accelerating? A
A basketball sits motionless on the gymnasium floor.
B
A hockey puck slows down and comes to a stop.
с
A soccer ball travels at 3 m/s for one second.
D
A train travels 100 km in a straight path towards the northeast.

B

Explanation:

acceleration is a change in velocity, and situation B is the only situation where the velocity of the object is changing

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.