Physics
When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?

Acceleration
Displacement
Energy
Velocity

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

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

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