設A,B兩點的速度為V(A),V(B),為什麼不能用 GMm/R(A)^2=mV(A)^2/R(A) ==>GMm/2R(A)=1/2mV(A)^2=K(A) GMm/R(B)^2=mV(B)^2/R(B) ==>GMm/2R(B)=1/2mV(B)^2=K(B) ==>K(A)/K(B)=R(B)/R(A)?????????? 謝謝!!