Uncertainty in pulley experiment efficiency measurement

[Peter G.]

I am processing the data in my pulley experiment and I have a doubt.

I am measuring the efficiency, thus, I measured the work I inputed in the system. For when the mass being lifted by me was moved by 0.05m, I exerted a 1.4 N force and I had to exert that force for 0.275, 0.28, 0.285. (Those are my repeats)

My question is: The uncertainty for the distance I moved the force would be the smallest degree of accuracy in my ruler or half the range?

Thanks,
Peter G.

 

[SteamKing]

What are the units for the duration of the effort? seconds, minutes, hours, fortnights?

 

[Peter G.]

meters.