Physics
The number of waves per second in a sound is called ________ of that sound.

Displacement
Velocity
Frequency
Acceleration

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Physics
Should cars have bumpers that collapse under impact?

Yes, since the offending car should get damaged and pay for the mistake
No, since it would be very expensive to get the car repaired
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

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