A student uses two magnets to pick iron screws out of a pile of scraps. Would more magnets attached to the top of the first two magnets help the students find the screws Easier? Why or why not?

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

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 •  

Acar travels 40m in 8 seconds find the car speed