ive been sick a lot lately, and have missed a lot of physics, my worst class, and im doing all the homework ive missed and cant figure out these 2 problems.everything else has been done. any help, like how to do them, i dont need the answer just how to set it up and such. anything would be helpfully. im an 11th grader, so its not college leveled. "A 2500kg car is moving at a speed of 20m/s. the car is slowing don with a constant force of 500N how long does it take to stop,how far does the car tavel as it comes to a stop,make a Force vs Time" "A train with a mass of 20,000 Kg is moving at 3m/s and attaches 2 other trains with the same mass,already attached. the two other cars are moving with a sppeed of 1.2m/s and moving in the same direction as the first car. what is the speed of the three joined cars, after the collision? change of kinetic energy during collision. what sort of collision has occured?"