Two in-phase loudspeakers, a and b, are separated by 3.20 m. a listener is stationed at c, which is 2.40 m in front of speaker b. both speakers are playing identical 214-hz tones, and the speed of sound is 343 m/s. does the listener hear a loud sound, or no sound?

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.

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