Question

. If Power applied is 20 watt to do work W = 2t2, how much time is taken to complete work? 1) 3 sec 2) 10 sec 3) 4 sec 4) 5 sec
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Answer 1

Answer:

my answer is 3. 4 sec

Explanation:

hope you are happy

Answer 2

Answer: 10 seconds

Explanation:

• Power is defined as the work done by an body per unit time.
• Work can be anything either done on the object or done by the object.
• So, the basic formulae of work is work done divided by time i.e., $\frac{work\ done}{time}$.
• Given, W=$2t^{2}$ and power applied is 20 watt to do the work.
• Power=$\frac{work}{time}$

   ⇒ $20=\frac{2t^{2} }{t}$

    ∴ t = 10 seconds

• Hence, the required time to do the given work was 10 seconds.

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