A runner travels south along a straight path for 5.5 h with an average velocity of 1.75 km/h, then travels south for 7.5 h with an average velocity of 0.90 km/h. What is the hiker’s displacement for the total trip? * A) 9.6 km to the south
B) 6.8 km to the south
C) 16.4 km to the south
D) 2.8 km to the south

Apossible explanation for a set of facts that can be tested by further investigation is called

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

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.