m 7. A ball is launched vertically, from the ground, with an initial velocity of 25 m/s. When the ball reaches the ground again, what will be its velocity? 0 15.19 m/s 0 15.19 m/s 0 25 m/s 0 34.81 m/s [:] 8. Which of the following statements about free fall acceleration on Earth is accurate? O It is intially 0 m/sz, but increases constantly . Q It is a constant value of 9.81 m/s2. Q It is a constant value of 9.81 m/s2. Q It is only positive when an object is moving upward. D 9. Robert is standing on a bridge that spans a canyon. He drops a pebble from the bridge, and records how long the pebble takes to reach the water below. If the pebble takes 5.49 seconds to reach the water, what is the height of the bridge? [:l 10. Elizabeth throws a coin vertically into the air. At its highest point, it is 3.1 meters above the ground. What is the coin's velocity when it is at its highest point