# No calculus required!

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.

Details:

• 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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