Question

If a bullet of velocity 400m per second can break 3 wooden planks how many wooden plank a bullet of velocity 1000m per second break through.

Answer 1

Answer:

Just make sure that the second plank is much thicker and made of a much harder wood! Not many bullets will go through three feet of oak.

Explanation:

srryyyy.......wrong answer but don't delete plzz

Answer 2

Answer:

Here is ur answer it is 19 planks

Explanation:

V^2=u^2+2as

0=400^2 +2a(3s)

400^2/3=2as let it be equation 1

Next condition

0=1000^2+2a(ns)

1000^2=2as*n

From first equation (2as=400^2/3)

So

1000^2=n*400^2/3

N=19

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