A body does 20 joules of work in 20 joules of work in 5 seconds. What is its power ?
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Power is calculated by using the formula : `"Power" = ("Work done")/("Time taken")` Here, Work done 20 J And, Time taken = 5 s So, putting these values in the above formula, we get: `"Power" = (20J)/(5s)` = 4 J/s Thus, Power `= 4 W" "` (because 1 J/s = 1 W) Thus, the power of this body is 4 watts.
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