Abaseball is thrown down a hill. this baseball has on-board sensors that can measure its velocities in both the x- and y- directions. the data show that the ball took off with an initial velocity in the y-direction of +4.0 m/s and had a final velocity of –5.8 m/s. calculate the hang time of the ball. [hint: believe it or not, it is possible to calculate hang time (the total time the projectile is in the air) by knowing only the initial and final velocities in the y-direction.]