A sled, of mass = 6.50 kg, is sliding down a snow-covered hill that has a slope of 45.0 degrees.  There is an applied force pushing down on the sled perpendicular to the incline of 80.4N.  The coefficient of kinetic friction between the sled and snow is 0.100.   Which of the free body diagrams below is draw correctly for the situation above? Continuing the question above:  A sled, of mass = 6.50 kg, is sliding down a snow-covered hill that has a slope of 45.0 degrees.  There is an applied force pushing down on the sled perpendicular to the incline of 80.4N.  The coefficient of kinetic friction between the sled and snow is 0.100.   Determine the acceleration of the sled down the slope.  Report your answer in meters per second squared, but only enter the numerical value.

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”