21. A sound wave traveling through a certain freshwater lake has a frequency of 249.2 Hz and a wavelength of 5.25 m. What is the speed of a sound wave in this water? (Round your answer to
three significant figures.)
(1 Point)
0.021 m/s
O 47.5 m/s
254.45 m/s
1308.3 m/s
O 1480 m/s

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .