A picture frame sits atop a bookshelf. When the bookshelf is bumped, the frame tumbles to the floor, landing after 0.64 s. How tall is the bookshelf? Q12. A ball is launched straight up into the air, where it has a downwards acceleration of magnitude 9.8 m/s^2. The ball has an initial velocity of magnitude 13.4 m/s. How long does it take the ball to reach its maximum height? (1.4s) Q13. (a) How long does it take for a golf ball to fall from rest for a distance of 12.0 m? (b) How far would the ball fall in twice that time? Q14. A 55 kg lead ball is dropped from the leaning tower of Pisa. The tower is 55 m high. (a) How far does the ball fall in the first 3.0 s of flight? (b) What is the speed of the ball after it has traveled 2.5 m downward? (c) What is the speed of the ball 3.0 s after it is released?