1. The problem statement, all variables and given/known data Straight from book: Marshall pushes crates starting from rest across the floor of his classroom for 3 seconds with a net force as shown. For each crate, rank the following from greatest to least... (a) Impulse delivered (b) Change in momentum (c) Final speed (d) Momentum in 3 seconds. All crates are pushed to the right... Crate A) F=100N, M=30kg Crate B) F=75N, M=20kg Crate C) F=50N, M=10kg 2. Relevant equations I'm using the following to try and make some sense of this... Impulse = Δp = Force * Time = Δmv Momentum = mv 3. The attempt at a solution Here is where a bit of confusion is setting in for me. I use the Force * Time equation to get an impulse, for crate A I got 300N, for crate B I got 225N, and for crate C I got 150N. Now, isn't 10N equal to 1 kg? However, in a YouTube explantion, which I didn't fully understand, nor does my book make a correlation between force (Newtons) and kilograms, which I find to be quite odd; in any case, 10 N = 1 kg, however it noted that 1N = 1 kg m/s. I don't understand how you go from 10N = 1 kg to 1N = 1kg m/s? I'm really struggling with this problem not because of equation but because I simply do not understand how I am to begin calculating this problem and what units to use. Also, I'm sure I could find speed/velocity but at this point before I start throwing numbers around and getting it wrong, a nice description of how I should approach this is what I am after. Please don't solve the problem for me, but rather if this 1N = 1kg m/s thing could be explained and how they are related I would great;y appreciate it. As it was taught that Newtons are a force and Kilograms are a unit of mass, two very different things.