To allow a speaker's voice to be heard in an auditorium, an amplifier was used to increase the sound energy (loudness) of the wave
seen in the image above the answer choices. Which wave is the result of amplification and produces a louder sound?
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What is the speed of an object at a given moment?

Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the ground. how long will the ball be in the air before it lands? how far will the football travel before it lands?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?