Which of the following best drfines medium of exchange

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.

For two variables in a direct proportion, what is the result of doubling one variable?