• 2021-04-14
    已知点沿半径为40cm的圆周运动,其速度规律为:(a);(b)(s以cm计,t以s计)。若,则上述两种情况下,点的速度大小和分别为()/sqp/img?f=7835bcfbb2a9c7ee3a6fcaca0d4083af.files%2Fimage011.png7835bcfbb2a9c7ee3a6fcaca0d4083af.files/image012.png/sqp/img?f=7835bcfbb2a9c7ee3a6fcaca0d4083af.files%2Fimage008.png7835bcfbb2a9c7ee3a6fcaca0d4083af.files/image015.png/sqp/img?f=7835bcfbb2a9c7ee3a6fcaca0d4083af.files%2Fimage016.png