Answer:
\[m=100\,kg,\]
\[u=30\,\,m/s\]
\[v=-20\,m/s\]
Impulse \[=m(v-u)\]
\[=100[-20-30]=100\times (-50)\]
\[=-5000\,\,Ns\]
Therefore magnitude of impulse = 5000 Ns
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