A block of mass 10 kg moving in $x$ direction with a constant speed of 10 ms–1, is subjected to a retarding force F = 0.1$x$ J/m during its travel from $x$ = 20 m to 30 m. Its final KE will be
475 J
450 J
275 J
250 J
A block of mass 10 kg moving in $x$ direction with a constant speed of 10 ms–1, is subjected to a retarding force F = 0.1$x$ J/m during its travel from $x$ = 20 m to 30 m. Its final KE will be