Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly

(a) p = 560 w.
(b) p = 87.5 w.
(c) p = 5,600 w
(d) p = 1.1 w.
(e) p = 875 w

To solve this problem we will use the concepts related to power, defined as the amount of energy applied over a period of time.

The energy in this case is the accumulated in the form of potential energy, over a period of time. Thus we will have that the mathematical expression of the power can be expressed as

Here,

E = Energy

t = time

As the energy is equal to the potential Energy we have tat

The weight (mg) of the man is 700N, the height (h) is 8m and the time is 10s, then:

Therefore the correct answer is A.

the answer is a 3.8cm

explanation: