関連ワード:  is acceleration zero when velocity is constant    is acceleration zero when speed is constant    is acceleration always zero when velocity is constant    acceleration must be zero when velocity is constant    can acceleration be zero when velocity is constant    if acceleration is zero then velocity is constant    can acceleration be non zero when velocity is constant    when velocity is constant then acceleration is zero    is acceleration 0 when velocity is constant    is acceleration zero when velocity is zero  
結果 : is acceleration zero when velocity is constant