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Point-like object at (0,0) starts moving from rest along the path y = 2x

^{2}-4x until point A(3,6). This formula gives the total force applied on the object:

**F**= 10xy

**i**+ 15

**j**. a) Find the work done by F along the path, b) Find the speed of the object at point A

For a) I have applied the formula for work with the integral and have integrated along the path to find the value for work. My first thought about approaching b) was since I know the total work and that the object starts moving from rest, I can use the work-energy theorem to find the speed at A. The problem with that is that I don't know the mass of the object.