1) A car of mass 1000 kg travelling at 15 m/s crashes into the back of a second car of mass 800 kg which was travelling at 5 m/s in the same
direction. The cars lock together after the collision. What velocity
do the cars move off with?

You want to lose weight and have been trying to decide which type of fad diet is best for you. you ask your doctor, who responds that a. fad diets are a temporary fix but generally don't have any side effects b. fad diets can be used several times a year to maintain a healthy weight c. fad diets can be risky for your health and, in the long run, do not work d. fad diets should never be used one right after the other; there should be a break between them select the best answer from the choices provided. a b c d