impulse & momentum的定义要熟悉i=ftp=mv那么二者关系:i=ft f=ma
(2)在水平面上:匀速行驶时,f=f;加速行驶时,f-f=ma.
9694物理竞赛f=ma美本申请敲门砖986995
传送带①静止不动,求v(先受力分析再用f=ma,也就是牛二定律,然后2ax=
【正文】1,律可得:f=ma,以上两式联立可得:mffmm8880,故b正确方法
Tips:Do Not Provide
Personal Loans: Go Easy On Your Finances
Finance, Finance, Finance, Foreign Exchange, Stocks, Currency Circle, Venture Capital, Bitcoin, ICO...