Explain whether people are more likely to eat too much or too little

Hydrogen and helium are both members of?

How will the system respond to a temperature increase?

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?