A spacecraft having 40,000 Kg mass..started its journey ...when - TopicsExpress

A spacecraft having 40,000 Kg mass..started its journey ...when it reached at 300 m/s .....A part of 10,000 kg was detached...... According to Law of conservation of momentum...we can find the next value of velocity of spacecraft is 400 m/s..... Kinetic energies...... at 1st-- 1.8*10^9 then--- 2.4*10^9 QUESTION is why energy is changed????? what is the problem with Law of conservation of ENERGY???????

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