Posted by **Bex** on Tuesday, February 3, 2009 at 8:01pm.

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.

- Physics - urgent -
**Bex**, Tuesday, February 3, 2009 at 8:27pm
Please, please, I really need gelp for this.

- Physics -
**bobpursley**, Tuesday, February 3, 2009 at 8:38pm
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.

- Physics -
**Bex**, Tuesday, February 3, 2009 at 9:05pm
oh, okay, hank you so much!

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