2. A 50-kg box is being pushed along a horizontal surface. The coefficient of static friction between the box and the ground is 0.65, and the coefficient of kinetic friction is 0.35, What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s2? A) 60 N B) 120 N C) 170 N D) 230 N E) 490 N Final formula: Required steps: 1) Draw free body diagram Add the forces acting on the box and label them 2) Choose reference frame 3) Find vectors components FN= ( FG = ( Add 2 more forces. No numerical values 4) Apply Newton's 2nd law

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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!