NEET2015Physics-Mechanics
NEET 2015 Physics Work, Energy and Power MCQ Question
Type: MCQ-numerical-Medium-Class 11
A block of mass 10 kg moving in x direction with a constant speed of 10 m/s, is subjected to a retarding force F = 0.1x J/m during its travel from x = 20 m to 30 m. Its final KE is
A
475 J
B
450 J
C
275 J
D
250 J
Correct Answer
Option D
Detailed Explanation
The work done by the retarding force is the integral of F over the distance, which is 25 J. The initial KE is 500 J, so the final KE is 475 J.
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