Một chất điểm M chuyển động thẳng trên trục Ox, lúc t=0 chất điểm M cách O 4m, sau 2s chất điểm chuyển động đến A cách O 9m. Tính quãng đường đi và vận tốc chất điểm.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

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.