An object is being dropped from a height H = 86 meters above ground. Assuming no air friction nor wind,
A. Show your reference system.
B. Based on your reference system, write the specific equation for position x and velocity v versus time
C. Determine the time taken by the object to reach the ground level. You must explain the logic of your solution, not just a memorized formula.
D. Determine the velocity of the object when it reaches ground level.
E. Determine the position of the object with respect to ground level at t= 4s.
F. Determine the position of the object with respect to ground level at time t=9s.