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
Yes, since they help to absorb the impact of a collision and keep the occupants safe
No, since it would be very expensive to get the car repaired

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Physics
Superconductors are substances which

conduct electricity at high temperatures
conduct electricity at low temperature
offer high resistance to the flow of current
offer no resistance to the flow of electricity

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Physics
Kinetic energy depends on

The pressure of the moving body
The velocity or speed of the moving body.
The mass of the moving body
Both mass and velocity of the moving body

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