6000 ml
There are 1000ml in one liter
ANSWER
My answer is in the photo above
U=0ms^-1
t=12s
a=-9.81ms^-1
v=?
from an equation,v=u+at
v=0+(-9.81)(12)
=-117.72ms^-1
Velocity = displacement / time
v = 400 / 2
v = 200 km/h
In short, Your Answer would be 200 km/h
Hope this helps!