A block of mass \( 10 \mathrm{~kg} \) moving in \( \mathrm{x} \) direction with a constant speed...

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A block of mass \( 10 \mathrm{~kg} \) moving in \( \mathrm{x} \) direction with a constant speed of \( 10 \mathrm{~ms}^{-1} \), is subjected to a retarding force \( F=-0.1 \mathrm{x} J / \mathrm{m} \) during its travel from \( x=20 \mathrm{~m} \) to \( 30 \mathrm{~m} \). Its final K.E. will be:
a. \( 450 \mathrm{~J} \)
b. \( 275 \mathrm{~J} \)
c. \( 250 \mathrm{~J} \)
d. \( 475 \mathrm{~J} \)
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