1. The problem statement, all variables and given/known data An air puck of mass 0.029 kg is tied to a string and allowed to revolve in a circle of radius 1.6m on a frictionless horizontal surface. The other end of the string passes through a hole in the center of the surface, and a mass of 1.4kg is tied to it, as shown in the figure. The suspended mass remains in equilibrium while the puck revolves on the surface. The acceleration of gravity is 9.81 m/s2 . What is the linear speed of the puck? answer in m/s. I got what the forces were- i drew a freebody diagram and had tension and gravity pointing down, with centrifigal acc pointing down as well. I got tension to be 13.734N and gravity to be .28449N. I plugged them into Fnet= ma so T+Fg= m(centrif acc) thing is, I'm not sure what to use for mass..is it the .029, the combined mass of the two or the mass of the weight on the bottom?