Question

jenny is trying to describe a wave. which example would be the best description?
a toy car hitting a wall and bouncing back
a toy car rear - ending a toy car that then rear - ends another toy car
two toy cars driving parallel to each other at the same speed
two toy cars driving away from each other at the same speed

Explanation:

A wave is a disturbance that transfers energy through a medium. In the case of a wave, energy is transferred from one point to another. When a toy car rear - ends another toy car which then rear - ends another, energy is transferred from one car (like a particle in a wave medium) to the next. A toy car hitting a wall and bouncing back is a simple collision and not a wave - like energy transfer. Two toy cars driving parallel or away from each other at the same speed do not show the energy transfer characteristic of a wave.

Answer:

a toy car rear - ending a toy car that then rear - ends another toy car