Physics - Kinematics Question with Solution | TestHub

A target is made of two plates, one of wood and the other of iron. The thickness of the wooden plate is$4 \mathrm{cm}$and that of the iron plate is$2 \mathrm{cm}$. A bullet fired goes through the wood first and then penetrates$1 \mathrm{cm}$into iron. A similar bullet fired with the same velocity from the opposite direction goes through iron first and then penetrates$2 \mathrm{cm}$into the wood. If$a_1$and$a_{\mathrm{2 }}$be the retardation offered to the bullet by wood and iron plates respectively, then