[问答题]
When an object falls frk+m wc /(.y8sj(:ml v5*l mslgmac9kc ixrr3hqy1f 6 s 9-jq)u kmk8+beely under the influence of gravity there is a net force mg exertedf 8kj-yi rk brh1s)u39xqq 6+m on it by the Earth. Yet by Newton’s third law the object exerts an equal and opposite force on the Earth. Why doesn’t the Earth move?
