9. rise to the challenge problem 2: john is riding on a bus traveling at an average speed of 2.0 x
10 m/s. twenty minutes after john starts his bus ride, john's mom realizes that he left his wallet
in her car. she chases the bus at an average speed of 27 m/s. how long does it take john's
mom to reach the bus? assume she started the chase at the same place john started his bus
ride. (hint: make a d vs. t graph for this situation and find the equation for each line.)

Geologists get to play with chemistry, physics, and history! and what a history you will meet as youwork your way through the course. starting at the beginning, the textbook provides the scientifically acceptedstart of the and promises that you'll get to explore some of the evidence for that scientific view, later inthe semester. meanwhile, which is more nearly correct of the scientifically accepted view? a) the earth formed when the big bang caused older materials to fall together, about 14 billion years ago.b) the earth formed from the falling together of older materials, about 4.6 billion years ago.c) the earth formed in the big bang, about 6000 years ago.d) the earth is eternal, having been here forever and promising to be here forever.e) the earth was assembled by gigantic space beavers, which gnawed down the primordial tree of life andpiled its branches together to form the planet.