NEET Physics Work-Energy Theorem MCQ Question
Consider a diagram where a block of mass m is moving with an initial speed v_i on a horizontal surface and encounters a retarding force F_r which is inversely proportional to the position x. What is the nature of work done by this retarding force as the block moves from x = 0.10 m to x = 2.01 m?
Negative work since the force opposes the motion.
Positive work since the force aids the motion.
Zero work since the force is perpendicular to the displacement.
Positive work since work is scalar and cannot be negative.
Correct Answer
Detailed Explanation
The retarding force opposes the motion of the block, resulting in negative work, as stated in the NCERT context where work done by friction is negative when opposing displacement.
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