Posted by Jessica on Tuesday, February 7, 2012 at 8:25pm.
a ball is thrown upward at a speed of 12 m/s. It will reach the top of its path in about:
a) 0.6 sec
b) 1.2 sec
c) 1.8 sec
d) 2.4 sec
Please explain how you find the answer!!! I cannot figure it out

Science  bobpursley, Tuesday, February 7, 2012 at 8:27pm
speed at the top is zero.
Vf=vi9.8t
0=129.8t
t= about ...

Science  Jessica, Tuesday, February 7, 2012 at 8:30pm
I learned the formula to be v=gt...why are you subtracting?
Also what is vf and vi?

Science  bobpursley, Tuesday, February 7, 2012 at 8:36pm
vf= final velocity, which is zero at the top.
vi is initial velocity.
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