An oak tree acorn with a mass of 0.52 ounces fell to the forest floor 120 feet below. Answer the below questions. As demonstrated in course lectures, you must show all equations, use only equations covered in lectures, and show all equation rearrangements units and unit cancellations to earn any credit. For all unit conversions, you must include a separate single picket fence showing all units and cancellations to earn any credit as done in lectures. a. Calculate the acorn's change in potential energy in units of Joules. b. Calculate the acorn's final velocity, in units of feet per second, just before it landed on the ground. Assume there was a negligible amount of air resistance