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# You kick a smooth flat stone out on a frozen pond. The stone slides, slows down, and eventually stops. This is because:

(A) the force pushing the stone forward finally stopped pushing on it
(B) no net force acted on it
(C) the stone has a natural tendency to be at rest
(D) a net force acted on it all along

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• Newton's first law states that when viewed in an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force.
Answer: a net force acted on it all along
After the stone was kicked, no force was pushing it along.
However, there must have been some force acting on the stone to slow it down and stop it. This is the frictional force.