- #1
MrGoATi
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Homework Statement
ball dropped in air at 20m/s.
why is v=20,v0=0 instead of v0=20,v=0
Homework Equations
a=v-v0 / t
s=x0+v0xt + at2/2
The Attempt at a Solution
a=g=9.8m/s2
I know I can solve it with first finding time(I get that) a=v-v0/t making it into t=v-v0/g
so 20/9.8=2.04s
but now from what I understand 20m/s is v0 is it not? can someone explain is it or is it not initial velocity, and why we don't use
s=v0xt+ gt2/2
but instead s=gt2/2
I know the answer is 20.4m, or maybe it's actually wrong?
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