Solve all three

A car with Mc=500kg moves west at 10 m/s and hits a truck with Mt=1500kg that is at rest. If the car bounces off with a speed of 5m/s. What's the truck velocity after the collision? Your answer You (60 kg) push your friend (80 kg) on a frictionless ice. If your friend begins to move at 4 m/s, how much will be your speed? Your answer Two bugs collide in midair. If a 10-g bug flying north at 1 m/s collides with a 8-g bug flying at 1 m/s south and both stick together, how fast will they be moving after the collision? In which direction? Your