You are standing in the bisdorf building stairwell 575 m

Question

Solve each part of following problem given below:

Problem: You are standing in the Bisdorf building stairwell 5.75 m below your lab partner, who throws your calculator vertically upward to you. You catch the calculator 2.3 s later.

Part A: With what initial velocity was the calculator thrown?

Part B: What was the velocity of the calculator just before you caught it?

Please also explain thanks in advance.