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=vi-9.8t

0=12-9.8t

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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