[单选题]
94.03: A ball is thri)i7j1zessbeb jy7t.u :o*n*q1 ,hp bown off a high cliff with no horiz mcvbjf*uye5 0zm1 .u up+k+ us-:a0boontal velocity. It lands 6.0 s later with a velocity ouas muubzuj k1f0pbe+*5.v:c+y0m - of 40 m/s. What was the initial velocity of the ball?
A. 100 m/s up
B. 20 m/s up
C. 0
D. 20 m/s down
E. 100 m/s down
