A car starts 10 m north of a reference point. it moves at a constant velocity over the next 5 s, reaching a position of 10 m south of the reference point.

what is the car's average velocity?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?