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Grade 11IIT JEE Entrance Exam

a bullet losses (1/nth) of its velocity passing through one plank. The number of such planks that are required to stop the bullet can be?

Profile image of Shubham Joshi
9 Years agoGrade 11
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1 Answer

Profile image of Sourabh Singh
9 Years ago
Before plank the velocity is V .
after first collision (n-1)/n * V
after this it will be ((n-1)/n)2 V.....

and it will go on .

Use infinite series formula and you will get the answer.

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