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A black paper absorbs light of all the colours and reflects none.

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From conversion from $$ms^{-1}$$ to $$kmh^{-1}$$ we get,

As $$1km=1000m$$ and $$1hr=3600sec$$

5 $$ms^{-1}$$ =$$\dfrac{5m}{sec}$$= $$\dfrac{5 \times 10^{-3}km}{1/3600hr}$$=$$0.005 \times 3600$$ =$$18kmh^{-1}$$

Hence,the speed 5 $$ ms^{-1} $$ is less than 25 km $$ h^{-1} $$.

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