A bullet hits a wooden block and loses half its velocity after penetrating 3cm. How much more will it penetrate before coming to rest?
Can we Solve this with work energy theorem?

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Solution

Let bullet be fired at velocity v . Given that velocity decreases to half after penetrating 3 cm i.e. when v becomes v/2 .
let s be distance travelled by bullet through 3 cm. Let F be retarding force offered by target.
Acc to work energy theorem, we can write kinetic energy as :

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