An object of mass 2kg is sliding with a constant velocity of 8m/s on a frictionless horizontal table.what is force required to keep the object moving with the same velocity.
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According to the Newton’s law of inertia (Newton’s First Law of Motion) the body can move with a constant speed only if it is acted upon by the balanced forces.In this question as the body of 2 kg is sliding with a constant velocity the gravitational pull of the earth on it is balanced by the opposing force (friction). So the force balancing the gravitational pull of the earth is equal to its weight = 2 ⨯9.8 N = 19.6 N
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18N correct answer
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