1. You have a 400 kg car traveling at 15 m/s. It takes 6 seconds to come to a complete stop when it hits a wall. How much force did it take?

Which is not true about oxygen-17 and oxygen-18?

Diamond will scratch quartz. true or false

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •