JEE Main Physics question
A body of weight 64 N is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are 0.6 and 0.4 respectively, the acceleration of the body will be (Acceleration due to gravity = g)
Answer: (D)
Solution
The applied force equals the limiting static friction: F = μₛW = 0.6×64 = 38.4 N. Once moving, kinetic friction is μₖW = 0.4×64 = 25.6
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