Answer:
<em>D)Twice as much</em>
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.
<em>constant: g = 9.8 m/s²</em>
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.
<em>The right option is D)Twice as much</em>
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