(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known dataOk, so i'm having alot of trouble finding time when it is not given in a projectile motion problem. Here's what I have set up:

X

A=O

Vi=100.0

VF=100.0

D=?

T=?

Y

A=-9.8

Vi=O

Vf=?

D=8848m

T=?

2. Relevant equations

Distance(d=1/2at2=vit)

3. The attempt at a solution

Ok, here's where my problem is, I can never get the time right. I have failed 2 tests and numerous homework assigments because something is wrong. Here's my attempt at it:

8848=1/2(-9.8)t2

I divide both sides by 8848 then square root it.

I ALWAYS get the wrong time and in turn that gives me the wrong distance and in turn I fail the test.

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# Homework Help: Projectile Motion: Finding Time

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