Science question:
worth a lot!

1. a 400 g toy car moving at 2 m/s collides and hooks up with 700 g toy car at rest and they move off together. what is their final velocity?

2. a car travels 15 km north, 10 km east, 20 km south, then 10 km west.
a. draw a diagram
b. what is the distance it travels?
c. what is ist displacement?

plz ! there is more than this but if u have the answer plz send it to me!