Thursday
December 18, 2014

Homework Help: physics and math

Posted by Madison on Wednesday, October 8, 2008 at 11:42pm.

hi guys, i had the following question but i keep on getting it wrong, should i use -9.8 or 9.8 m/s2 for the acceleration? im confused and would really appreciate some help.

A student throws a set of keys vertically upward to her sorority sister, who is in a window 3.70 m above. The keys are caught 1.60 s later by the sister's outstretched hand.
(a) With what initial velocity were the keys thrown?
m/s upward

(b) What was the velocity of the keys just before they were caught?
m/s is it upwards or downwards?

thanks to anyone who can help me

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