1. A skateboarder moving at 6.15 m/s along a horizontal section of a track that is slanted upward by 46.9o above the horizontal at its end, which is 0.544 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, find the maximum height H to which she rises above the end of the track.
2. A tennis ball is struck and departs from the racket horizontally with a speed of 29.4 m/s. The ball hits the court at a horizontal distance of 20.7 m from the racket. How far above the court is the tennis ball when it leaves the racket?
3. A 51.8-g golf ball is driven from the tee with an initial speed of 56.7 m/s and rises to a height of 34.4 m.
(a) Neglect air resistance and determine the kinetic energy of the ball at its highest point.
(b) What is its speed when it is 8.43 m below its highest point?