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Grade: 11
        A bullet on penetrating 2 successive wooden planks of unqual thickness loses its velocity by 200meter per second in each case. If the initial velocity is 1000meter per second calculate the ratio of thickness of the Planks.
one year ago

Answers : (1)

Eshan
askIITians Faculty
2086 Points
							Loss in kinetic energy of bulletthrough a block\proptothickness of the block.

Hence for the first block

\dfrac{1}{2}m(1000^2-200^2)\propto t_1

for the second block,

\dfrac{1}{2}m(200^2-0^2)\propto t_2

\implies \dfrac{t_1}{t_2}=\dfrac{1000^2-200^2}{200^2}=24
one year ago
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