由s=v0t+0.5at²比较系数可知本题中v0=24m/s,a=－3m/s².6s是的速度v=v0+at=24m/s+(－3m/s²)×6s=6m/s6s内的位移s=v0t+0.5at²=24m/s×6s＋0.5(－3m/s²)×(6s)²=90m 零用微分的方法也可...