Asked by Jessica

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
Answered by bobpursley
speed at the top is zero.

Vf=vi-9.8t
0=12-9.8t

t= about ...
Answered by Jessica
I learned the formula to be v=gt...why are you subtracting?

Also what is vf and vi?
Answered by bobpursley
vf= final velocity, which is zero at the top.
vi is initial velocity.

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