A(n) can prevent some bacterial diseases

Vaccine

Explanation:

A vaccine is any preparation that can be produced from toxoids, attenuated bacteria and/or viruses or made by genetic engineering. Its function is to generate in the human body active and longlasting immunity against a specific disease by stimulating the production of antibodies that will then act protecting the person against future infections.

To understand it better:

Vaccines teach the human body how to defend itself when pathogenic microorganisms, such as viruses or bacteria, invade it. This is achieved by exposing the body to a safe and very small amount of viruses or bacteria that have been weakened or destroyed, so that the immune system recognizes it for what it is and destroys the infectious agent.

Hence:

the maxium height is 34m/s