Physics question? I keep getting the wrong answer!?

[Watchin the Stars]

A 76 g autographed baseball rolls off of
a 1.3 m high table and strikes the floor a
horizontal distance of 0.6 m away from the
table.

How fast was it rolling on the table before
it fell off? The acceleration due to gravity is
9.81 m/s2 .
Answer in units of m/s.

 

[dancesissy432]

I'm sorry that I couldn't give you the answer, but I hate it when people don't answer, so here.... now you have an answer!

 

[dorfineer]

i'm not going to solve it for you, but solve for the amount of time it take for it to fall down 1.3 m strait down. then use this equation:

x = (Vo)t+0.5at^2 to solve for the horizontal speed which is also the speed it was going when it rolled off the table. you can assume horizontal acceleration is 0 m/s^2