[单选题]
A nuclear reaction is said9e 8io(mhej5k t+ j5fm to be exothermic if the totl8jkz smg2h). al kinetic energy is
A. less after the reaction than before.
B. equal both before and after the reaction.
C. greater after the reaction than before.
D. zero after the reaction.
Post time 2024-1-22 00:52:09