4. An object is at rest on an incline. The component of gravity acting downward and along the incline on the object is described as F_(g,x)=+8.0N . Which axis is pointing up the incline? a. +x-axis b. +y-axis c. -x-axis d. -y-axis

The correct answer is c. -x-axis.<br /><br />The component of gravity acting downward and along the incline on the object is described as $F_{g,x}=+8.0N$. This indicates that the force is acting in the positive x-direction. Since the object is at rest on the incline, the force due to gravity along the incline must be balanced by the force exerted by the incline on the object. Therefore, the force exerted by the incline must be in the opposite direction to the force due to gravity, which is the negative x-direction. Hence, the axis pointing up the incline is the -x-axis.