If you lift one load up two stories, how much work do you do compared to lifting one load up only one story?
a) four times as much
b) one quarter as much
c) one half as much
d) twice as much
e) the same amount

D)Twice as much

Explanation:

Work: This is the product of force and distance along the direction of the force. The S. I unit of work is Joules (J)

Energy: Energy is the ability or the capacity to perform work. Energy and work can be interchange during calculation.

E = W = mgh Equation 1

Where m = mass of the load, h = height of one story, g = acceleration due to gravity.

constant: g = 9.8 m/s²

When the load is lift up only one story

W = 9.8mh Equation 2

But when the load is lifted through two story,

height = 2h

W = 19.6mh Equation 3

Comparing Equation 2 and equation 3,

It shows that the work done to lift the load up two story is twice the work done to lift the load up one story.

The right option is D)Twice as much

multiply 2kg by latent heat of vap