Determine the time taken by the object to reach the ground

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.

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