No calculus required!

From the figure (sorry for "paint" quality XD). A mass mm is placed on a frictionless surface with angle θ1\theta_{1} to the vertical line. It's pulled by constant force F=42.25 newtonF = 42.25 \text{ newton} using a massless string such that the mass don't float when it's pulled. After I stop pulling this mass when the rope does the angle θ2\theta_{2} to the vertical line, find the amount of work done by FF in joules\text{joules} at the point when I stop pulling it.


  • Pulleys are very strong that they always stay still, massless, and frictionless.
  • g=9.8ms2g = 9.8 \frac{m}{s^{2}}
  • m=25.1kgm = 25.1 kg
  • This problem is from my physics teacher.

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