A child pushes a 25 kg box by applying a horizontal force on a frictionless plane inclined at 15°. a) Find the magnitude of the force F required by the child to move the box upwards at a constant speed. b) Find the normal force exerted by the surface on the box (Warning: The horizontal force exerted by the child is parallel to the ground, not to the inclined plane.) (cos15° = 0.966; sin15 ° = 0.259) (= 9.8 ms²/).

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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!