Physics
A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ?

They must have the same mass
They must have the same density
They must be dropped in vacuum
They must have the same volume

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Physics
Hydro-electric power is a:

A mixture of renewable and non-renewable natural resource
Renewable natural resource
Neither renewable nor non renewable resource
non-renewable natural resource

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