If the dogsled is moving at a constant speed in a straight line, this indicates that the forces acting on it are balanced. This is a situation described by Newton's first law of motion, which states that an object will remain at rest or in uniform motion unless acted upon by a net external force.
In this case, the forward pull of the dogs must balance the backward pull of friction. Therefore, the correct statement is:
The forward pull of the dogs balances the backward pull of friction.
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