Question

A 2.0kg object initially at rest explodes breaking into two pieces of mass 5.0kg and 15.0kg. If the 15.0kg piece moves with a speed 2m/s what is the speed of the 5.0kg piece?

A. -6 m/s
B. 15 m/s
C. -5 m/s
D. 20 m/s
assuming the original mass was really 20.0 kg,

total momentum must remain at zero, so

15.0*2 + 5.0v = 0
Yes the original mass was 20.0kg my mistake. According to my calculations the answer will be -6m/s.

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