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Figure. A smooth circular path of radius...

Figure. A smooth circular path of radius R on the horizontal plane which is quarter of a circle A block of mass m is taken from position A to B under the action of a constant force F. Calculate the work done by force F.
a. If it is always directed horizontally
b. If the block is pulled by a force F which is always tangential to the surface
c. Block is pulled with a constant force F which is always directed towards the point B

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