The picture below shows three elevators, each carrying a different number of people to different floors. If all the people weigh the same, which elevator is doing the most work? (Weight = Force, and Number of floors = Amount of displacement)

Select one:
a. Elevator 1 is doing the most work.
b. Elevator 2 is doing the most work.
c. Elevator 3 is doing the most work.
d. They're all doing the same amount of work.

Option D

They are all doing the same amount of work

Explanation:

For Elevator 1

For Elevator 2

For Elevator 3

Here,

W = F • d

For Elevator 1

W = 1 • 10

W = 10 Nm

For Elevator 2

W = 2 • 5

W = 10 Nm

For Elevator 3

W = 10 • 1

W = 10 Nm

Here, In each case the work done is same.

Thus, They're all doing the same amount of wwork

-TheUnknownScientist 72

a.

explanation:

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day