Carts A and B have equal masses and travel equal distances D on side-by-side straight frictionless tracks while a constant force F~ acts on cart A and a constant force 2F~ acts on B. Both carts start from rest. The velocities ~vA and ~vB of the bodies at the end of distance D are related by:.

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is