1. The problem statement, all variables and given/known data If two objects of unequal mass and unequal Kinetic energy hit each other, they lose some energy to other forms but keep enough to do Work on each other. A good example is a car and wind, a man and ball could also apply, a ball with KE could stop a running man if KE does work, though that is hard to do as energy is taken up many other forms- - back to car and wind, wind moving has mechanical energy in the form of Kinetic energy and a car has Kinetic energy, If a Car with 700 Joules of KE is moving to the right and a gust of wind with 1400 Joules from the left, what happens to the car and the wind? 2. Relevant equations Fs=1/2m*v^2 TMEi+Wnc=TMEf W=F*D Wnc=ΔME 3. The attempt at a solution The wind has Mechanical energy in the form of Kinetic energy, this allows the wind to apply a force, doing work by a non-conservative force as a air particles convert KE which is ME into non-conservative work, transferring energy to what it hits. The wind will be able to apply a non-conservative force, thus altering the mechanical energy of what it hits. A car with 700Joules, so TMEi-Car + (-TMEi-Wind)= TMEf (700Joules)+(-1400Joules)=700Joules TMEf, the Car is stopped and then moved backed, the wind is doing work, the wind stopped the car and had 700 Joules left to push the car backwards. What is wind and its KE used for? Wind farms! wind with KE does work onto the blades of wind mills, the applied non-conservative force pushes the blades giving them KE which is ME, thus that ME is turned into power, electrical energy - - however, power is created which is supplied to homes and schools, thus Mechanical energy in both forms PE and KE is able to do work.