During an autumn storm, a 0.012-kg hailstone traveling at 20.0 m/s made a 0.20-cm-deep dent in the hood of Darnell’s new car. If the Force of the hail was 1200 N downwards, what was the time of impact of the damaging hail stone?

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?