1. The problem statement, all variables and given/known data A block is projected with a speed of 3.0 m/s on a horizontal surface. if the block comes to rest in 1.5 m, what is the coefficient of kinetic friction between the block and the surface? 2. Relevant equations M=Ff/N (Fapplied-Ff)=ma I'm not really sure which equations to use for this problem since there is no mass given for the block. 3. The attempt at a solution I really have no idea how to go about doing this problem! I've been solving more complex friction problems but I'm currently baffled since there is no way to calculate a force, etc. I'm taking a 12th grade physics class, by the way.