A 60-Kg Object,initially at Rest in Free Space,"explodes" into Three Segments

Multiple Choice

A 6.0-kg object,initially at rest in free space,"explodes" into three segments of equal mass.Two of these segments are observed to be moving with equal speeds of 20 m/s with an angle of 60 $\degree$ between their directions of motion.How much kinetic energy is released in this explosion?

A) 2.4 kJ
B) 2.9 kJ
C) 2.0 kJ
D) 3.4 kJ
E) 1.2 kJ