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Since we know that according to the Newton second law of motion we have the equation as,

F= ∆P/∆t

So if the momentum is same then F is inversely related to time.

Since lead bullet will obviously penetrate and will take more time so will have relatively less force will be applied to knock the bear down.

But on the other hand the rubber bullet will just strike the body of the bear for little time instead of getting penetrated ,so it will deliver more force.

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