A certain amount of work "W" was done in 10 seconds. If the same amount of work was done in 20 seconds, what will be the change in power?

$\frac{W}{20}$

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$\frac{W}{10}$

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$\frac{W}{5}$

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$\frac{W}{2}$

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Solution

The correct option is A. $\frac{W}{20}$ .
We know, $P o w e r = \frac{W o r k}{T i m e}$

When, time = 10 seconds $\Rightarrow P o w e r = \frac{W}{10}$

When, time = 20 seconds $\Rightarrow P o w e r = \frac{W}{20}$

Change in power = $\frac{W}{10} - \frac{W}{20}$ = $\frac{W}{20}$ .

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A certain amount of work "W" was done in 10 seconds. If the same amount of work was done in 20 seconds, what will be the change in power?

The correct option is A. W20.We know, Power = WorkTime When, time = 10 seconds ⇒ Power = W10 When, time = 20 seconds ⇒ Power = W20 Change in power = W10 − W20 = W20.

The correct option is A. $\frac{W}{20}$ .
We know, $P o w e r = \frac{W o r k}{T i m e}$

When, time = 10 seconds $\Rightarrow P o w e r = \frac{W}{10}$

When, time = 20 seconds $\Rightarrow P o w e r = \frac{W}{20}$

Change in power = $\frac{W}{10} - \frac{W}{20}$ = $\frac{W}{20}$ .