15. Which of the following is NOT an example of projectile motion? A football thrown in the air 10 yards b. A ball that has rolled off a table C. A plane accelerating on a runway d. An apple that has fallen from a tree 16. Assuming a negligible amount of air resistance, for an object in projectile motion, in what direction is the velocity of the object constant? a. Horizontal b. Vertical Both d. None 17. Assuming a negligible amount of air resistance, for an object in projectile motion, in what direction is the velocity of the object accelerating? a. Horizontal b. Vertical Both d. None 18. A 5 kg cannonball is dropped from a cliff that is 120 m tall At the same time, an 8 ky cannonball is launched directly horizontally at 6 m/s from a height of 120 m. Each cannonball has the same shape. Assuming a negligible amount of air resistance, which object will hit the ground first? The dropped cannonball b. The horizontally launched cannonball C. They hit at the same time d. There is not enough information 19. A baseball is thrown horizontally at 8 m/s. How long will it take the ball to travel a range of 40 m (assuming it doesn't hit the ground before then)? a. 5 s C. 40 320 s 20. A water balloon is dropped from a skyscraper. How tall is the skyscraper if the ball reaches the ground in 10 seconds? 1. 4.9 m 49 m C. 490 m d. 4900 m 21. A juggler throws a bell directly upwards in the air What is the velocity and acceleration of the ball at its maximum height? Velocity is 0 m/s and Acceleration is 0 m/s b. Velocity is 0 m/s and Acceleration is -9.8 m/s C. Velocity is non-zero and Acceleration is 0 m/s* d. Velocity is non-zero and Acceleration is -9.8 m/