Practicing Success
A ball is thrown upwards from the plane surface of the ground. Suppose the plane surface from which the ball is thrown also consists of the points A(1, 0, 2), B(3, -1, 1) and C(1, 2, 1) on it. The highest point of the ball takes, is D(2, 3, 1) as shown in the figure. Using this information answer the question. |
The co-ordinates of the foot of the perpendicular drawn from the maximum height of the ball to the ground are |
$\left(\frac{43}{29}, \frac{-77}{29}, \frac{-9}{29}\right)$ $\left(\frac{9}{7}, \frac{-1}{7}, \frac{-10}{7}\right)$ $\left(\frac{43}{29}, \frac{77}{29}, \frac{9}{29}\right)$ $\left(-\frac{13}{29},-\frac{7}{29},-\frac{19}{29}\right)$ |
$\left(\frac{43}{29}, \frac{77}{29}, \frac{9}{29}\right)$ |
line perpendicular to plane → $\frac{x - 2}{3} = \frac{y-3}{2} = \frac{z-1}{4} = λ$ (x, y , z) = (3λ + 2, 2λ + 3, 4λ + 1) points on line eq. of plane → 3x + 2y + 4z = 11 as foot of perpendicular lies both on line and plane ⇒ 3(3λ + 2) + 2(2λ + 3) + 4(4λ + 1) = 11 9λ + 4λ + 16λ + 6 + 6 + 4 = 11 29λ = -5 $λ = \frac{-5}{29}$ foot of perpendicular (3λ + 2, 2λ + 3, 4λ + 1) = $\left(\frac{43}{29}, \frac{77}{29}, \frac{9}{29}\right)$ |