12. Which of the following phenomena applies the first law of motion?

A. A leaf sways back and forth falling from a tree.
B. When a ball falls on the floor, the ball bounces back up.
C. When pushed with the same force, a car accelerates slower than a grocery cart.
D. When a cardboard with a coin on top is suddenly pulled, the coin falls into the glass.

Newton's first law of motion, also known as the law of inertia, states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. This law is applicable in situations where there is no net force acting on an object, leading to various phenomena:

A. The correct option that applies the first law of motion is C, where a car accelerates slower than a grocery cart when pushed with the same force due to differences in mass and acceleration.
B. In contrast, options A, B, and D involve external forces or interactions causing the observed motion, not in line with the first law of motion.

Learn more about Newton's first law of motion here:

https://brainly.com/question/38603068