Q5. A bullet of mass 50 g is fired with a speed $100 \mathrm {~m} / \mathrm { s }$ on a plywood and emerges with $40 \mathrm {~m} / \mathrm { s }$. The percentage loss of kinetic energy is : (1) $84 \%$ (2) $16 \%$ (3) $32 \%$ (4) $44 \%$
Q5. A bullet of mass 50 g is fired with a speed $100 \mathrm {~m} / \mathrm { s }$ on a plywood and emerges with $40 \mathrm {~m} / \mathrm { s }$. The percentage loss of kinetic energy is :\\
(1) $84 \%$\\
(2) $16 \%$\\
(3) $32 \%$\\
(4) $44 \%$