1. The problem statement, all variables and given/known data a rock is tossed straight up with a speed of 18m/s. when it returns, it fallls into a hole of 12 m deep. a) what is the velocity of the rock as it hit the bottom of the hole? b)how long is the rock in the air, from the instant it is released until it hit the bottom of the hole? 2. Relevant equations a)v^2 = u^2 – 2as b) displacement = final - initial 3. The attempt at a solution a) and i got 12.8 and i know is wrong b) ?