Physics
What is the principle of a ''Life Jacket"?

The person can sit on it like a raft
It increases the volume of the person to keep him afloat
It decreases the volume of the person to keep him afloat
It provides oxygen to a drowning person

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Physics
Acceleration is

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

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