JEE Main Physics question
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 the 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 the opposite direction goes through iron first and then penetrates 2 cm into wood. If and be the retardation offered by the wood and iron plates respectively, then
Answer: (B)
Solution
Let the common initial speed be . Forward trip: (through wood) and (stopping in iron), so . Reverse trip:
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