Difference between polar protic and polar aprotic solvents

Question

Assignment:

Q1. What would happen to the rate of ^Sn² reaction if the solvent was changed from acetone to water?

Q2. How do E₁ and E₂ mechanisms depend on the properties of a base?

Q3. What is the difference between polar protic solvent and polar aprotic solvents and how do they determine if a reaction is going to be ^Sn¹, sn2, E₁ or E₂

Provide complete and step by step solution for the question and show calculations and use formulas.