posted by Mancoba .
A stone thrown from the top of a building which is 30m is given an initial velocity 20m/s verticaly upward.the stone misses the edge of the building on its way down.
A,what is the velocity of the stone after 1second,n after 3seconds.
B,find the maximum height reached by the stone .
C,how long does it take the stone to reach the ground.