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A bullet moving with a speed of 100 ms^(...

A bullet moving with a speed of `100 ms^(-1)` can just penetrate into two planks of equal thickness. Then the number of such planks, if speed is doubled will be .

A

4

B

8

C

6

D

10

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(2)m(100)^2=R(2t)`
`(1)/(2)m(200)^2=R(nt)`
`n=8`
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