Asoccer player with a mass of 60 kg is traveling at 8 m/s when he completes a corner kick on a 0.45 kg soccer ball. the soccer ball travels toward the goal at a speed of 35 m/s. in this elastic collision, what is the speed of the soccer player immediately after kicking the ball?
a) 5.4 m/s
b) 7 m/s
c) 7.7 m/s
d) 8 m/s

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

Positrons are spontaneously emitted from the nuclei of

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.