[问答题]
When an object falls z+ey xd.ea,v7t.yow.freely uhh2e,/ cw)sb qvv*t.hsn95dznder the influence of gravity there is a net force mg exerted on it by the Earth. Yet by Newton’s third law the object exerts an equal and opposite force on the Earzv * /h)b ,q9enwv.2 shshct5dth. Why doesn’t the Earth move?
