Atruck driver travels 55 km in 1 hour he then drives a speed of 35 km/h for two hours next he drives 175 km in three hours. what was his average speed?

Suppose that recording station n is located 200 km north of the epicenter of an earthquake, and recording station s is located 100 km south of the epicenter of the same earthquake. which of the following statements would be true?

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?