Abody of mass 2 kg is moving in the positive x-direction with a speed of 4 m/s collides head on with an another body of mass 3 kg moving in the negative x-direction with a speed of 1 m/s . during collision a loud sound is heard and they both start moving together . the sound energy cannot be greater than :
a) 12 j
b) 14 j
c) 15 j
d) 17.5 j
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