[问答题]
When an object falls freely under the influenc6 a(ggo8c w n8mgdl2el* pv,qpnm)36je of gra1rae,igx:lab 4zb3;ivity there is a net force mg exerted on it by the Earth. Yet by Newton’s third law the object1e3z b:x,ag 4 ri;bila exerts an equal and opposite force on the Earth. Why doesn’t the Earth move?
