A $30\, gm$ bullet initially travelling at $120 \,m/s$ penetrates $12 \,cm$ into a wooden block. The average resistance exerted by the wooden block is ........... $N$
A $30\, gm$ bullet initially travelling at $120 \,m/s$ penetrates $12 \,cm$ into a wooden block. The average resistance exerted by the wooden block is ........... $N$
$2850$
$2200 $
$2000$
$1800$
A $30\, gm$ bullet initially travelling at $120 \,m/s$ penetrates $12 \,cm$ into a wooden block. The average resistance exerted by the wooden block is ........... $N$
$F = \frac{{m\,({u^2} - {v^2})}}{{2S}} = \frac{{30 \times {{10}^{ - 3}} \times {{(120)}^2}}}{{2 \times 12 \times {{10}^{ - 2}}}} = 1800\,N$