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Grade: 11

                        

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?

4 years ago

Answers : (1)

Sourabh Singh
IIT Patna
askIITians Faculty
2104 Points
							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.
3 years ago
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