Sarah is standing on top of a very tall building and decides to drop a ball off of it. Two seconds later, she throws another ball straight down. What speed should Sarah throw the second ball such that the two balls meet 10 seconds from when the first ball was released?

Tsunamis are fast-moving waves often generated by underwater earthquakes. in the deep ocean their amplitude is barely noticeable, but upon reaching shore they can rise to an astonishing height of a six-story building. one tsunami generated off the aleutian islands in alaska, had a wavelength of 897km and traveled a distance of 3280km in 4.18h. (a) what was the speed (in m/s) of the wave? find the waves (b) frequency and (c) period.