Science
posted by Layla .
how do you calculate if a block of wood dropped form a tall building has attained a velocity of of 78.4 m/s, how long has it been falling?

I don't understand the question.

if gravity is rounded to 10 and 78.4 is rounded to 78:
then, time= velocity/gravity
time=78/10
time=7.8
or...
time=78.4/9.8
time= 8