Whats the purpose of resolving it to x and y components

The x component of the force on an incline plane is m*g*cos(theta) and the y component is mg*sin(theta). The normal force or x component, keeps the object in contact with the plane, and the y component of the force is so we can solve speed, acceleration, distance travelled, etc for the object using conservation of energy.

Hope this helps. Any questions please just ask. Thank you.

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