A soccer ball is kicked into the air. Its height above the ground can be approximated

by using the equation h = - 3t2 + 15t, where h is the height above the ground in

meters and t is the time in seconds.

a) What are the zeros of this relation?

b) When does the ball hit the ground?

c) When does the ball reach its maximum height?

d) What is the maximum height of the ball?

Question

Mathematics

Aldo Gates

4 August, 19:20

A soccer ball is kicked into the air. Its height above the ground can be approximated

by using the equation h = - 3t2 + 15t, where h is the height above the ground in

meters and t is the time in seconds.

a) What are the zeros of this relation?

b) When does the ball hit the ground?

c) When does the ball reach its maximum height?

d) What is the maximum height of the ball?

+2

Answers (1)

Know the Answer?

Kate Ramsey · Answer 1

See below in bold.

Step-by-step explanation:

a) h = - 3t^2 + 15t = 0

-3t (t - 5) = 0

t = 0, 5 are the zeroes of the relation.

b) The ball hits the ground when h = 0 so it is after 5 seconds.

c) The path of the ball is a parabola which opens downwards so the maximum height is when x = 5/2 = at 2.5 seconds.

d) this maximum height is - 3 (2.5) ^2 + 15 (2.5) = 18.75 meters.