Final answer:
Kendra was likely given an opioid analgesic after her accident, as these are powerful pain relievers commonly used in medical settings for pain management post-trauma or surgery.
Step-by-step explanation:
After an accident, Kendra was most likely given a shot that reduced her pain. This shot would most likely be an Opioid analgesic. Opioids are known for their potent analgesic properties, which means they decrease pain effectively. In cases of trauma or after surgery, morphine, oxycodone, and codeine are examples of opioids that are commonly used for pain relief. They work by mimicking the body's own pain-killing mechanism and binding to opioid receptors to reduce pain and can sometimes produce euphoria as a side effect.