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Member warned about re-posting the same problem statement in new threads. Infraction points awarded.

## Homework Statement

If you were to throw a large log over the edge of the Grand Canyon and it took 5.65 seconds to hit the ground, calculate the velocity of the log at impact in m/s and calculate the distance the log fell in feet.[/B]

## Homework Equations

vf=vi+at[/B]

## The Attempt at a Solution

So I get vf=(9.8)(5.65)= 55.4 ...But then I think about it, and the object is going downwards so shouldn't it's velocity be negative (South)..? Also, is 9.8 supposed to be positive or negative?[/B]