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To lift a load of 100 N a distance of 1 m an effort of 25 N must be applied over an inclined plane of length 4 m. What must be done to lift the load 2 m, using the same effort?
A) Use an inclined plane of length 8 m.
B) Use an inclined plane of length 2 m.
C) Use an inclined plane of length 10 m.
D) Use an inclined plane of length 16 m.

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mixter17
Hello!

Answer: 

A: Use an inclined plane of length 8m

Explanation:

Since we are going to use the same effort (or work in this case) if we use 4m to lift the load a distance of 1 m. In order to lift the load 2 m, we need to multiply the distance by 2.

[tex]W=F.d \\ 25N.4m=100N.m \\ 25N.4m.(2)=100N.m.(2) \\ 25N.8m=100N.2m[/tex]

So, we have that to lift a 100N load a distance of 2m, we need to use an inclined plane of length 8m.

Have a good day!
A) use an inclined plane of length 8 m.

To raise the load over 2 m using the same effort, an inclined plane with the same mechanical advantage as the original one should be used. So 

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