posted by armando .
a ball is dropped from height of tower 300m .after 1s another ball is dropped with 20m/s from tower .when and where they meet?
first ball: h=300-1/2 g t^2
second ball: h= 300-20(t-1)-1/2 g (t-1)^2
set the two equations equal, and solve for t. THat is when
put t into either equation to find where.