Air Resistance Problem: Dropping two balls with different masses

[Richard8786]

Homework Statement

A certain ping-pong ball has mass of 2.4 g and a terminal speed of 10.0 m/s as it falls through air. Suppose the same type of ping-pong ball is then filled with water such that it has a new mass of 21.6 g and it is dropped through the air. (a) Determine the acceleration of the water-filled ball as it falls at 10.0 m/s through the air. (b) Determine the terminal speed of the water-filled ball assuming that the air resistance is proportional to the square of the speed.

Relevant Equations

None

I am not sure how to even start this problem.

 

[Bystander]

You are supposed to show some "good faith" attempt at a solution. See guidelines.

 

[haruspex]

I am not sure how to even start this problem.

Usual place: free body diagrams showing the forces acting in the different cases.