If a bullet is fired from a gun . Then
(A) During firing of the bullet from gun , the chemical energy of powder of bullet is converted into the kinetic of the system . So, final mechanical energy of system is greater than initial kinetic energy of the sysem.
(B) In this case chemical energy (non-mechanical) is converted into mechanical energy of the system.
(C) The same reason as the above.
(D) The same reason as (A) and (B).
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