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Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects