A bullet loses 1/20 of its velocity after penetrating a plank. how many planks are required to stop the bullet? a) 9 b) 11 c) 7 d) 5
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there is a formula to find it
let no.of planks is 'm'
let 1/n=the velocity it losses
m=n^2/2n-1
m=400/40-1
=400/39
=10(approx.)
let no.of planks is 'm'
let 1/n=the velocity it losses
m=n^2/2n-1
m=400/40-1
=400/39
=10(approx.)
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