Calculating velocities with only acceleration and time

[noelani]

This was a basic physics experiment. A ball was thrown upward and then caught. Calculate initial and final velocity given: acceleration= -9.8m/s^2 (gravity); time= 2.12sec



delta x=Vi*t+(.5)(t)^2
Vf=Vi+at




I actually don't know where to begin. I don't know an equation for velocity that doesn't require displacement (which I also need to find).

 

[drizzle]

if it's caught at the same horizontal level, then v_i=v_f [note the direction of each, one is + and the other is -]

solve!


ps. welcome to PF :)

 

[noelani]

if it's caught at the same horizontal level, then v_i=v_f [note the direction of each, one is + and the other is -]

solve!


ps. welcome to PF :)

Thanks for the help. So how would I figure out which equation to use?