The graph illustrates motion of a bucket being lowered into a well from the top at the instant ( t=0 ) down to the water level, filled with water and drawn up again. Here 'x' is the depth. Find the average speed of the bucket in ( mathrm{m} / mathrm{s} ) during whole operation.

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( begin{aligned} text { ang speed } &=frac{text { Total distace covad }}{text { Total time to tere }} & 30+30 & 20 &=frac{60}{20} &=3 mathrm{m} / mathrm{s} end{aligned} )

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