No calculus required!

Classical Mechanics Level 4

From the figure (sorry for "paint" quality XD). A mass \(m\) is placed on a frictionless surface with angle \(\theta_{1}\) to the vertical line. It's pulled by constant force \(F = 42.25 \text{ newton}\) 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 \(\theta_{2}\) to the vertical line, find the amount of work done by \(F\) in \(\text{joules}\) at the point when I stop pulling it.


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

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