PLEASE HELP. I WILL MARK BRAINIEST Mrs. Kucalaba uses a spoon to tap a glass of water three times. All three taps created sound waves. The first tap could not be heard. The second tap could be heard faintly. The third tap could be heard loudly. How did the sound waves produced by the three taps differ?

A. they differ by the amount of energy carried by each wave

B. They differ by the type of sound waved produced

C. They differ by the speed of sound waves produced

D. They differ by the form of energy produced by each tap

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".