Physics
A sphere rolls down on two inclined planes of different angles but same height, it does so

With the same speed
In the same time with the same speed
In the same time with the same kinetic energy
In the same time

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Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.
the pressure is the same as that outside.

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