Answer:
\[m=100\,\,g=\frac{1}{10}kg\]
\[u=30m/s\]
\['t'=5\]sec is 0
\[\Rightarrow \]final velocity of the ball = v = 0 m/s
\[F=?\]
We know that, \[F=ma=m\left( \frac{v-u}{t} \right)\] ……(1)
\[\left( \because a=\frac{v-u}{t} \right)\]
\[{{N}_{1}}\]Substituting the above values in (1), we have,
\[F=\frac{1}{10}\times \left( \frac{0-30}{5} \right)\]
\[\Rightarrow F=\frac{1}{10}\times -6\]
\[=-0.6\,\,kgm/{{s}^{2}}=-0.6N\]
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