. an object is launched straight up into the air from the ground with an initial vertical velocity of 30 m/s. the object rises to a highest point approximately 45 m above the ground in 3 seconds; it then falls back to the ground in 3 more seconds, impacting with a speed of 30 m/s. (a) the average speed of the object during the 6-second interval is closest to (a) 0 m/s. (b) 5 m/s. (c) 15 m/s. (d) 30 m/s. (b) the magnitude of the average velocity during the 6-second interval is closest to (a) 0 m/s. (b) 5 m/s. (c) 15 m/s. (d) 30 m/s
