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A target is made of two plates, one of w...

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

A

`a_1=2a_2`

B

`a_2=2a_1`

C

`a_1=a_2`

D

data insufficient

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