physics
posted by flay .
object a does a freefall motion from an 80m building and object b thrown upward from the base at the same time. they collide after 2s. find the initial velocity of object b. height is 80 m.

physics 
bobpursley
object 1: h=801/2 g t^2
object 2: h=vi*t1/2 g t^2
set them equal.
vi*t=80
solve for vi
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