I am not understanding a concept in electronics. When people say positive and negative charges I get confused as electrons are negatively charged and if they become positive they would be antimatter, which doesn't happen. So if someone could clear up why people say positive and negative charges I would be grateful.

What is the kinetic energy of a 10-kg bicycle moving at 10 m/s

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.