Question

A bullet emerges out from a wooden plank with
75% of its initial kinetic energy. The number of
additional planks required to stop the bullet is
​

Answer 1

Answer:

3 additional planks are required to stop the bullet.

Explanation:

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Answer 2

Answer:

v is dirctly propotional to d

and

k is directly propotional to d

plank is exerting force retardation

one is 25 percent reduced

so there are 4 planks needed to block the bullet