29. You are standing on a balcony on the 15th floor of the Bank of America building in San Francisco. The balcony is 72 m above the ground; the top of the building is 52 floors (237 m) high. You launch a ball straight up in the air from the balcony. The initial vertical speed is 75 m/s. (For this problem, you may ignore your own height, which is very small compared to the height of the building.) a. How high up does the ball go above the ground? b. After the ball has been in the air for 4.2 sec, calculate i. its instantaneous velocity at 4.2 s . Is it rising or falling? How can you tell? ii. its average velocity for the first 4.2 s. iii. its position at 4.2 s. Is it above or below the balcony? How can you tell? c. How fast is the ball going right before it hits the top of the building? d. For how many seconds total is the ball in the air