Sara weighs 450 N. She climbs a flight of stairs to a height of 3 m. It takes her 5 seconds. She plans to climb the flight of stairs again in the same amount of time, but this time while carrying two heavy books.

How does the amount of work she does change from the first to the second trip up the stairs?

A.
The work increases, and then decreases.

B.
The work decreases, and then increases.

C.
The work decreases.

D.
The work increases.

Question

Sara weighs 450 N. She climbs a flight of stairs to a height of 3 m. It takes her 5 seconds. She plans to climb the flight of stairs again in the same amount of time, but this time while carrying two heavy books. 
 
How does the amount of work she does change from the first to the second trip up the stairs?
 
 A.
The work increases, and then decreases.
 
 B.
The work decreases, and then increases.
 
 C.
The work decreases.
 
 D.
The work increases.

anonymous · Answer

Work = Force x Distance 
In this case Force = Mass x Gravity
The first time she is only carrying her own mass when she climbs the ladder
The second time she will be carrying her mass + the mass of the 2 books
So what happens to the work based on our equation?

anonymous · Answer

the work increases...because when anything is moved from one position to other work is done

anonymous · Answer

I would say D

anonymous · Answer

thank you