STANDARD Physics Work-Energy Theorem MCQ Question
A block of mass 10 kg is moving in x-direction with a constant speed of 10 m s⁻¹. It is subjected to a retarding force Fᵣ = -0.1 x J m⁻¹ during its travel from x = 20 m to x = 30 m. Its final kinetic energy will be
250 J
275 J
450 J
475 J
Correct Answer
Detailed Explanation
From work-energy theorem, the work done is equal to the change in kinetic energy. The work done by the retarding force is calculated as the integral of Fᵣ over the distance, resulting in a change in kinetic energy. The final kinetic energy is 475 J.
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