An arrow is shot from the top of a platform. The path of the arrow can be modelled by

Question

the relation h = -0.005(t - 26)^2 + 5, where h is the height of the arrow in metres and
t is the time in seconds after the arrow was shot.

a,Find the coordinates of the vertex the parabola

b,how long will it take the arrow to reach its maximum height

c,what is the maximum height

d,what is the height of the building?(calculate h when t=0)

Answer 1

(a) the equation is already in vertex form, so just read it off.
(b) max height is at the vertex
(c) so, h(26) = ___
(d) h(0) = ____

the only interesting question which cannot just be read directly from the equation is: when did it hit the ground?