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You put an antimatter explosive in a 63 kg space rock, initially at rest. Upon detonation, the rock fractures into two pieces. A 26 kg chunk is observed to zip off to the right (the positive direction) at 23 m/s. Calculate the final velocity of the other chunk, in m/s.

(Please answer to the fourth decimal place - i.e 14.3225)

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The answer I have is 0 kg m/s, not 24 kg m/s. I was just not sure how to calculate to get 0 kh m/s. Can you recheck the problem to see if it was done correctly? Thanks.