Does the kinetic energy of a car change more when it goes from 10 m/s to 20 m/s or when it goes from 20 m/s to 30 m/s ?
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Case - I : `K.E._(I)=1/2 times m times 10 times 10=50m" "J` `K.E._(F)=1/2 times m times 20 times 20=200m" "J` Difference in K.E. = 200m - 50m = 150m J Case - II : `K.E._(I)=1/2 times m times 20 times 20=200m" "J` K.E._(F)=1/2 times m times 30 times 30=450m" "J` Difference in K.E. = 450m - 200m = 250m J
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