(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If the rock is thrown from the top of the building with a velocity of 5m/s [Up].

And you know acceleration due to gravity is 9.81m/s^2 [Down].

And the height of the building is 50m.

Please help! I can't find the time for it to reach the bottom! I am letting up be positive!

2. Relevant equations

d = V1(t) +1/2(a)(t^2)

That's the only one I can think of! Help!

3. The attempt at a solution

The only way I can do it is to plug in the givens into the formula, am I doing it right or is there something more?

-50=5(t)+1/2(-9.81)(t^2)

0=-4.90500(t^2)+5t+50

t=3.74s or t=-2.73s

I feel stupid, please help!

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# Homework Help: Easy free-falling kinematics question help!

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