22) This question is a continuation of question 21. This question asks us to find the initial height of the object. We could either use energy or kinematics for this question; however, I wouldn't recommend using the conservation of energy because this would require you to use the final velocity you solved for in the last question. The reason this is bad is if you got question 21 incorrect, using your answer from that problem will undoubtedly give you the wrong answer.
We have the same situation and initial conditions for this problem
Since F[g] is the only force acting on the object, we can use g for acceleration. Now, using kinematics we have enough to solve for the initial height.
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