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A block moving horizontally on a smooth surface with a speed of 40 m/s splits into two parts with messes in the ratio of 1:2 If the smaller part moves at 60 m/s in the same direction , then fractional change in kinetic energy is :

A

`(2)/(3)`

B

`(1)/(8)`

C

`(1)/(2)`

D

`(1)/(4)`

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