Solve the all parts of following question given below:
Question: Kikyo shot an arrow in the vertical direction at the initial velocity was v0 = 68.6 m/s.
Part I: What is the instantaneous speed of the arrow at the top of the arrow's path?
Part II: How long does the arrow take to reach the top?
Part III: How high can the arrow reach vertically?
Part IV: How long does it take to return to the ground?
I need help to find the instantaneous speed of the arrow at the top of the arrow's path.