Answer:
\[m=5\,kg\,\,u=20m/s\,\,v=0.20m/s\]
Change in momentum
= Final momentum - initial momentum
= (mass × final velocity) - (mass × initial velocity)
\[=(5\times 0.20)-=(5\times 20)\]
\[=5\,\,(0.20-20)\]
\[=5\times 19.80=99\,\,kg\,\,m/s\]
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