1. The problem statement, all variables and given/known data a 200-g projectile is fired with a velocity of 900m/s towards the center of the 15-kg wooden block, which rests on a rough surface. If the projectile penetrates and emerges from the block with a velocity of 300m/s, determine the velocity of the block just after the projectile emerges. How long does the block slide on the rough surface, after the projectile emerges, before it comes to rest again? the coefficient of kinetic friction between the surface and the clock is μk=0.2. 2. Relevant equations conservation of momentum ∫ƩFdt=∫mdv Fr=N*μk N=W W=m*g and maybe ƩF=ma? 3. The attempt at a solution Attempt is an attached pdf. I am stuck on how to find the force the bullet applied to the block. With that I could do Fb-Fr=ƩF, ƩF(t2-t1)=∫mdv where Δt would be my answer. Any guidance would be appreciated. Thank you!