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如果是單一方向的直線運動,則可設全程距離為S,全程平均速度為V平, V平=S / t總 =S /(t前+t後) =S / [(0.5S / V前)+(0.5S / V後)] =V前*V後/ [ 0.5*(V前+V後)] =5*3 / [ 0.5*(5+3)] =3.75 m/s
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