Available scientific evidence suggests that which of the following is the age of the Earth?

A) 7 million years
B) 4.5 million years
C) 6,400 years
D) 4.5 billion years
E) The age of the earth is unknown

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.