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**v**= a

**i**+b

*x*

**j**

Now I want to find

**a**.So I apply chain rule and differentiate dv/dx * dx/dt = b

**j*** V

*x*= b

**j***a

**i**??

Now what does this mean? Is this allright? Should I not care about the vector directions when differentiating and just use the magnitudes

**a**= ab , if yes then why? And what will be the direction of the acceleration then?