You are probably expected to ignore air friction and just use the acceleration due to gravity to solve this problem.
Gravitational acceleration is a constant for your situation - you should know the value of gravitational acceleration from your textbook.
A) The formula for displacement for an object under constant linear acceleration is
x = v0t + ½at2
where x is the displacement from the position at time t = 0, v0 is the initial velocity and a is the constant acceleration (gravitational acceleration). Use this formula to find the answer.
B) The formula for velocity under constant acceleration given the displacement x is
v2 = v02 + 2ax
Use this formula for part B.
Hope this helps,
Stephen La Rocque.