Physics
Acceleration is

Directly proportional to force
Directly proportional to mass
Inversely proportional to mass
Inversely proportional to force

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Physics
Should cars have bumpers that collapse under impact?

Yes, since they help to absorb the impact of a collision and keep the occupants safe
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 the offending car should get damaged and pay for the mistake

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The density of sea water is more than the density of river water
The sea is wider than the river

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