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NEET UG PHYSICS MCQ: MOTION IN A STRAIGHT LINE

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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 2cm into wood. If

{a_1}

and

{a_2}

be the retardation offered to the bullet by wood and iron plates respectively, then

View answer and explanation

Correct option: B

{a_2} = 2{a_1}

Option B (

{a_2} = 2{a_1}

) is correct because the work done by the resistive forces is equal to the initial kinetic energy of the bullet. By setting up equations for both scenarios and solving for the ratio of retardations, we find that the retardation offered by the iron plate is twice that of the wooden plate.

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