Buddy is unloading 7kg cans using a 45 degree downward ramp. The ramp was made slippery by the a detergent spill before. Buddy can push the cans off of his truck with an initial velocity of .2 m/s and it moves as 1.2 m/a by the time it reaches the lowest point on the ramp. The next week the detergent has been cleaned up and buddy realizes that a can pushed at 0.2m/s will come to a halt just before the lowest point of the ramp. What is the magnitude of kinetic friction between the can and the clean ramp?