which will be more effective in knocking a bear down

(a)A RUBER BULLET OR (b)a lead bullet of the same momentum.

To determine which type of bullet would be more effective in knocking down a bear, we need to consider the factors that contribute to a bullet's stopping power. The two main factors to consider are the bullet's ability to transfer energy to the target and its ability to penetrate deep enough to reach vital organs.

1. Energy transfer: Rubber bullets are typically less lethal and are designed to cause less harm by having lower energy transfer upon impact. They are often used for non-lethal purposes, such as riot control or animal deterrence. On the other hand, lead bullets are designed to transfer as much energy as possible to the target by expanding or fragmenting upon impact. This rapid transfer of energy can cause significant tissue damage and potentially incapacitate the target.

2. Penetration: Bears have thick hides, muscles, and bones, so a bullet must penetrate deep enough to reach vital organs to be effective. Rubber bullets are generally less effective in terms of penetration compared to lead bullets, which are specifically designed to penetrate and cause damage to the target.

Considering these factors, it is highly likely that a lead bullet would be more effective in knocking down a bear compared to a rubber bullet. However, it is important to note that stopping a bear requires heavy firepower, and the use of firearms should only be considered in situations where it is necessary for self-defense and legal.

Please note that this answer provides general information and should not be taken as personal advice or encouragement to engage in any specific activities.