Solve the all parts of given question:
Question: Standing on the ground 2.6m from a building, you want to throw a package from your 1.5-m shoulder level to someone in a window 3.9m above the ground.
Part A: At what speed should you throw the package so it just barely clears the windowsill?
Part B: At what angle should you throw the package so it just barely clears the windowsill?
Please do a step by step solution since I'm kind of lost with this question and express your answer using two significant figures.