Physics
If the velocity of a body is halved its kinetic energy ________

Becomes 1/4 th
Becomes half
Is also doubled
Become 4 times

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

Metals have higher thermal capacity than plastics
Metals are good conductors of heat
Plastics have a lower density than metals
Plastics have a higher thermal conductivity than metals

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