I have a physics question.
Q. in the winter sport of curling, two teams alternate sliding 20 kg stones on an icy surface in an attempt to end up with the stone closet to the center of a target painted on the ice. during one turn, a player releases a stone that travels 27.9 m before coming to rest. the friction force acting on the stone is 2.0 N. what was the speed of the stone when the player released it?

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.