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**i dont get it------someone please help**

Hi, i think i might have gotten the first aspect of this question right, but the other parts im not too sure about...ie i have no idea what its going on about.

Question: An object is attracted toward the origin with a force given by F_x = -k/(x^2)

part a: Calculate the work done by a force F_x when the object moves in the x-diection from x_1 to x_2.

for this i found the integral of the force with limits x_1 to x_2 , i ended up with something like

work = k( (1/x_2) - (1/x_1) )

this might be totally wrong though

partb: if x_2 is greater than x_1, is the work done by F_x positive or negative?

i got negative, because it turns out negative for the integral answer.

partc: The only other force acting on the object is a force that you exert with your hand to move the obect slowly from x_1 to x_2. How much work do you do?

i have absolutely no idea whats going on here, they dont tell u what this force is???

partd: if x_2 is greater than x_1 is the work you do positive or negative? (in relation to part c)

please help

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