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

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

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Physics
A hydrogen balloon floats up because of

The pressure inside the balloon is more than the pressure outside it
Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight

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