Why does the energy of a sound wave decrease over time ?

The sound waves become weaker and farther away and the amplitude decreases, so the sound waves decrease.

Hope this helps :)

if the forces acting on an object are unbalanced, the object will accelerate in the direction of the net force on the object.

explanation:

this is best explained by having an understanding of newton's second law, which states that f=ma. you see, when the forces are unbalanced, net force (sum of all forces) is not zero. therefore making it necessary for the object to have an acceleration in the direction of the net force.

volts times amps 6 x 0.5 3w