Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in lifting the stone is equal to rolling it.
Work done in rolling a stone is less than in lifting it.
Work done in rolling is more than in lifting.
Work done in both is same but the rate of doing work is less in rolling.

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Physics
A white and smooth surface is

Good absorber and good reflector of heat
Bad absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and bad reflector of heat

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