Homework Help: physics

Posted by Joel on Friday, January 14, 2011 at 3:18pm.

if a ball is thrown vertically upward and is caught 5 seconds,how fast must have been going when it left the person s hand?help

physics - bobpursley, Friday, January 14, 2011 at 4:38pm
time in air is 5s.

hf=hi+vi*t-4.9t^2
0=0+5*vi-25*4.9 solve for Vi

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