instantaneous velocity
noun [ U ] physics specialized uk/ɪn.stənˌteɪ.ni.əs vəˈlɒs.ɪ.ti/ us/ɪn.stənˌteɪ.ni.əs vəˈlɑː.sə.t̬i/
瞬时速度
a calculation that tells you how far and in what direction an object would travel if it continued in the way it was going for one second