You want to draw a free body diagram of the forces on the sled in the horizontal x-direction.
If you visualize the system in an x-y coordinate plane, the force along the x-direction is the angle it makes with the x-axis multiples by the force.
The angle made with the x-axis is cosine of the angle theta.
Please see picture attached.
The Newton is defined as the:
C. Force that can give a 1-kilogram mass an acceleration of 1m/sec squared.
<h3>Hope it helps..</h3>
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