Physics
According to special theory of relativity the mass of a particle

Is independent of its velocity.
Increases with increase in velocity with respect to an observer.
Decreases with increase in velocity.
Decreases with decrease in velocity.

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

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

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