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To determine the power required to lift a 50-kilogram mass to a height of 20 meters in 1 minute, we first calculate the work done against gravity, which is equal to the weight of the object times the height: ( W = mgh = 50 , \text{kg} \times 9.81 , \text{m/s}^2 \times 20 , \text{m} = 9800 , \text{J} ). Since the work is done in 1 minute (60 seconds), the power ( P ) can be calculated using ( P = \frac{W}{t} = \frac{9800 , \text{J}}{60 , \text{s}} \approx 163.33 , \text{W} ). Therefore, approximately 163.33 watts of power is employed.

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