What are the three requirements of sound​

Anybody wanna ? (picture included? )

2. -/1 pointsserpse10 2.7.p.017.mi. an object moving with uniform acceleration has a velocity of 14.0 cm/s in the positive x direction when its x coordinate is 2.97 cm. if its x coordinate 2.85 s later is -5.00 cm, what is its acceleration? cm/s2 need ? read it master it

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