A person pushes a 12.5 kg lawn mower at constant speed with a force of 82.5 N directed along the handle, which is at an angle of 45.0° to the horizontal. Part C Calculate the normal force exerted vertically upward on the mower by the ground. Express your answer with the appropriate units. μà ? FN = Value Units Submit Request Answer Part D What force must the person exert on the lawn mower to accelerate it from rest to 1.7 m/s in 2.5 seconds, assuming the same friction force? Express your answer with the appropriate units. H μA ? F₂ = Value Units Submit Next > Provide Feedback Request Answer

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!