A group of bike riders went on a 4-hour trip. During the first 3 hours, they traveled a total of 50. kilometers, but during the last hour, they traveled only 10. kilometers. What was the group's average speed for the entire trip

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.

Which inventor was often called the lady edison

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?