Patra drops her toy from the balcony. The toy hits the ground in 2.5 seconds. What is the velocity of the toy the instant before it hits the ground? (Please help me, I have to turn this in today)

Compare these two waves : a. the blue wave has a higher pitch, but the orange wave is louder. b.the blue and orange waves have the same volume, but the blue wave has a higher pitch. c.the blue and orange waves have the same pitch, but the blue wave is louder. d.the orange wave has a higher pitch, but the blue wave is louder.

Which of the following elements is a representative element? a. chromium (cr) b. aluminum (al) c. mercury (hg) d. silver (ag)

What is the molar mass of potassium nitrate, kno3