Can somebody mee plzzz?

Blank liquids and gases exert a buoyant force on objects placed in them

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m

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.