[SOLVED] URGENT---Frictional force A force of 1.6N is applied to a box of mass 1.8Kg. It accelerates 0.6m/s^2. Determine Ff and the coefficient of kientic friction. K so I knoe how to do this. But in the text book, it has been done in a different way. So what I did is Found the net force using F=ma. Then i subtract from 1.6 and get Ff. Then use the formula mk= Ff/Fn In the book they took Ff=ma Which is the right solution?