Physics
Two stones of different masses are dropped simultaneously from the top of a building

Larger stone reaches the ground earlier
Depends on the composition of the stone
Both the stones reach the ground at the same time
Smaller stone reaches the ground earlier

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a lower density than metals
metals have higher thermal capacity than plastics
plastics have a higher thermal conductivity than metals
metals are good conductor of heat

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