It has been theorized that all of the modern continents on earth were once part of a single continent. what scientific evidence is used to support this theory? a. the coastlines of some modern continents appear to have once fit together. b. fossils of similar lifeforms have been found on different continents. c. some of the continents that exist today have similar types of rocks.

(its a multiple choice answer)

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?