What executive branch position is appointed by the president

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

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.