Physics
posted by Bex on .
a bowling ball is thrown down from the top of a building at 20 m/s. Find the distance the ball travels in
A) 1 s
B) 3 s
should I make the 20 m/s negative? I'm assuming the ball is just being thrown stright down...
I'm using the formula d=V(initial)*t+1/2a*t^2
I'm getting 24.9 for a and 104.1 for b if I assume that 20 m/s is negative. I just really need someone to clear this up for me. please and thank you.

Please, please, I really need gelp for this.

yes, make the intial velocity negative, and a is negative also.
d= vi*t+1/2 g t^2 in the first second.
d=20*1 4.9 *1=24.9 meters, if + is upward. 
oh, okay, hank you so much!