NEET 2026 Physics question
A particle of mass moves along a horizontal axis from to . The coefficient of kinetic friction varies as a function of as , where , are constants of appropriate dimensions, so that . The magnitude of the total work done by the frictional force during the motion is , where is the acceleration due to gravity. The value of is:
Answer: (4)
Solution
Since , we have , so and . The friction force has magnitude (normal reaction on the horizontal surface) and acts opposite to the displacement. Magnitude of work done by
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