Author Question: After an elastic collision of two balls, the kinetic energies of the two balls are measured to be ... (Read 78 times)

schs14 · **on:** Jul 28, 2018

After an elastic collision of two balls, the kinetic energies of the two balls are measured to be 12J and 24J. What can be said about the kinetic energy of the two balls before the collision?
a. nothingnot enough information is given
b. the balls had the same energies, 12J and 24J respectively
c. the total kinetic energy of the two balls was 36J
d. none of the above

Question 2

A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, the person's power output is
a. 0
b. 3 W
c. 30 W
d. 1,200 W
e. 12,000 W