Formula use:
F=m\times a
a=\large\frac{v-u}{t}
Explanation
Mass = 147 gm
Initial velocity (u) = 0
Force = 15 g-wt
\rightarrow15\times980 dyne
\therefore\ 14700 dyne
Now,
F=m\times a
\rightarrow 14700=147\times a
\rightarrow a=\large\frac{14700}{147}
\therefore a=100\ cm/s^2
Now,
a=\large\frac{v-u}{t}
\rightarrow100=\large\frac{v-0}{2}
\rightarrow 200=v-0
\therefore v=200\ cm/s
So that, after 2 sec the velocity will be 200c/s or 2m/s.
Ans: v=2m/s.