(1)求抛物线的解析式及点的坐标;
(2)连接,是线段上一点,关于直线的对称点正好落在上,求点的坐标;
(3)动点从点出发,以每秒2个单位长度的速度向点运动,过作轴的垂线交抛物线于点,交线段于点.设运动时间为秒.
①若与相似,请直接写出的值;
②能否为等腰三角形?若能,求出的值;若不能,请说明理由.
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2