Question: A force of 50N acting at 37degrees above the horizontal pulss a block along the floor with constant velocity. If the coefficient of friction between the blocck and the floor is 0.2, what is the mass of the block? the answer in the book is 23.4kg but when I did it I got 20.3kg. my friend did it and he got 23.4kg but when I use his calcutions and calculated out I get 23.5kg. He says you have to take the Normal force and substract 50sin37 because its being pulled along that direction. I say do you don't. Help?