RE-NEET 2024 Physics Work Done by a Force MCQ Question
An object moving along horizontal x-direction with kinetic energy 10 J is displaced through x = (3î) m by the force F⃗ = (−2î + 3ĵ) N. The kinetic energy of the object at the end of the displacement x is
10 J
16 J
4 J
6 J
Correct Answer
Detailed Explanation
The work done by the force is the dot product of force and displacement. Only the x-component of the force does work: W = Fₓ * x = (-2 N) * (3 m) = -6 J. The final kinetic energy is 10 J - 6 J = 4 J.
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