Hi everyone, I'm taking an online "Driver Safety" course and came across this gem: "Here is an example of how disastrous the force of impact can be: If you weigh 100 pounds, are traveling at 30 mph, and hit a stationary object, the force of impact is 3000 pounds (mass multiplied by acceleration). " Now I'm currently a medical student and its been a while since I took introductory physics, but that statement seems fishy to me. They appear to be using pounds both for the mass and the weight, whereas I thought that pounds were a measurement of weight. But then I looked on Wiki and found that there are many different definitions of the term 'pound.' Also, it looks like they just multiplied the pounds by the speed in mph, which makes absolutely no sense. Overall the statement confuses me and I was hoping someone with a better grasp of physics could make some sense of it, and maybe improve my grasp of physics in doing so.