Can you also PLEASE explain the answers cause I have nooo idea what to do.

SOLVE ON SEPARATE SHEETS OF PAPER!!! 1. A car of 2500kg heading west at 6m/s collides with a 3500kg car heading north at 12m/s. What is the final speed and direction (angle) of the mangled mess? 2. A jogger jogging at 3m/s south hits a walker traveling at 1.5m/s east. If the jogger continues south at 1.5m/s, what is the final speed and angle of the walker? 3. A car of 2000kg heading west collides with a 3000kg car heading north at 14m/s. If the final speed is 25m/s at 23 north of west. What is the initial speed of the westbound car? 4. A 75kg jogger jogging at 6m/s north hits a 150kg walker traveling 3m/s west. If the jogger continues north at 1.5m/s, what is the final speed and angle of the walker? 5. In the game of curling the red team's stone is traveling at 8m/s and hits the blue team's stone (at rest) and leaves at a 30 angle while the blue team's stone leaves at 30 below the horizontal what is the final speed of each stone? 6. A car of unknown mass heading west at 6m/s collides with a 3500kg car heading north at 12m/s. What is the mass of the car if the final speed is 10m/s and the angle is 25 degrees? 7. A 2600kg car heading west at 15m/s collides with a 3500kg car heading north. What is the initial speed of the car if the final speed is 18m/s and the angle is 250