Physics
Should cars have bumpers that collapse under impact?

Yes, since the offending car should get damaged and pay for the mistake
No, since the colliding car would then ram into the occupants and kill them
No, since it would be very expensive to get the car repaired
Yes, since they help to absorb the impact of a collision and keep the occupants safe

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Physics
For an ideal gas, which one of the following statements does not hold true?

The speed of all gas molecules is same
The potential energy of the gas molecules is zero
There is no interactive force between the molecules.
The kinetic energies of all gas molecules are not same

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