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**Hello, following is the mechanics problem involving pulley from an engineering mechanics book. I am trying to understand the solution given. As the car is being pulled, upward of the incline is assumed to be positive x direction. But when they apply the relative acceleration equation, in eq 3, the acceleration of the point P with respect to the car is entered as +4. Since**is acting downward the incline, this should be entered as -4 in equation 3. What people here think ?

**the acceleration of the point P with respect to the car****I have attached the problem and its solution as the PNG image file.
**

**thank you**