Question

Kamya climbs up a staircase in 5 minutes, Suraiya takes only 3 minutes in going up the same staircase. The weight of Kamya is equal to the weight of Suraiya.(i) Which of the two does more work?
(ii) Which of the two spends more power?

Answer 1

Answer:

(i) Work done is independent of the time so,both done equal work.

(II) Suraiya takes less time so her power is more than the kamya.

Explanation:

(i) Since we know that work done is defined as force times displacement.

work done is independent of the time so,both done equal work.

(ii) Weknow that power is define as the derivative of work done with respect to time.

$p = \frac{dw}{dt}$

since from the above relation we get that power is inversly proportional to the time.

So suraiya takes less time so her power is more than the kamya.