Physics
A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of

36 m/s
25 m/s
30 m/s
18 m/s

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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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