A bomb is kept stationary at a point. It suddenly explodes into two fragments of masses 1 g and 3 g. the total K.E. of the gragments is `6.4xx10^(4)J`. What is the K.E. of the smaller fragment
A. `2.5xx10^(4)J`
B. `3.5xx10^4J`
C. `4.8xx10^(4)J`
D. `5.2xx10^(4)J`