You are riding your bike to the mall. you travel the first mile in ten minutes. the last mile takes you 15 minutes. this is an example of: a. average velocity, b. positive acceleration, c. instantaneous speed, or d. negative acceleration

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?