Question

A giant rolls a bowling ball with a uniform speed of 30 m/s

Answer 1

120 (m) / 30 (m/s) = 4 secs,

which means the ball stayed in the air for 4 secs,that gives the height of the desk,which is

1/2 gt^2 = 0.5 x 9.8 x (4) ^ 2 = about 80 m