NEET Physics Work-Energy Theorem MCQ Question
A block of mass 1 kg is moving on a horizontal surface with an initial speed of 2 m/s. It enters a rough patch where the retarding force is inversely proportional to x, given by F(x) = -0.5/x for 0.1 < x < 2.01 m. What is the final kinetic energy of the block as it crosses the patch?
0.5 J
0 J
0 J
0 J
Correct Answer
Detailed Explanation
The work-energy theorem states that the work done on the block equals the change in its kinetic energy. The work done by the retarding force is calculated using the integral of F(x) over the displacement, resulting in a final kinetic energy of 0.5 J.
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