A 2.0 kg mass traveling at 3.0m/s strikes another 2.0kg mass traveling at -1.0m/s. They collide and have a perfectly elastic collision. If the second mass is moving at 3.0m/s after the collision,
what is the speed and direction of the first mass?

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

Convection currents are caused by differences in what two things?

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?