[单选题]
94.03: A ball is thrown off a high-mk zn,o4xu4c:h. ddp cliff with no horizontal velocit*)0tcnfxr,ih ie)vg5g e3z) m y. It lands 6.0 s later with a velocity of 40 m/s. What was ther nv 3gg 5 *zh)x0i,)emiec)ft 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