Saturday

February 28, 2015

February 28, 2015

Posted by **Anonymous** on Saturday, October 18, 2008 at 5:01pm.

the question is

A worker drops a wrench form the top of a tower 80.0m tall. What is the velocity when the wrench strikes the ground?

I know that the change of distance 80.0m

I know aceleration of free fall is -9.81m/s^2

but I don't think that I have enough information to find the velocity final because I don't know the velocity initial I'm completly lost

Help Me

- Physics -
**Damon**, Saturday, October 18, 2008 at 5:09pmAssume that he just dropped the wrench and the initial velocity is 0

-80 = -(1/2) 9.81 t^2

t = sqrt (160/9.81) = 4.04 seconds before crash

so

V = 0 - 9.81 t = -39.6 m/s

- Physics -
**Anonymous**, Thursday, October 24, 2013 at 6:57pmFhghu

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