Question

A lighthouse is situated on the top of a cliff. A stone is thrown from the top of the lighthouse. The stone falls past the base of the lighthouse and lands after 6 seconds in the water below. The displacement of the stone is
s(t)=-5t^2+20t+25 for
0≤t ≤6

a)Find the initial displacement of the stone
b)use quadratic theory to graph it
c)At which time and place does the stone change its direction?
d)For what time interval is the stone above the ground?

Answer 1

Explanation:

lighthouse is situated on the top of a cliff. A stone is thrown from the top of the lighthouse. The stone falls past the base of the lighthouse and lands after 6 seconds in the water below. The displacement of the stone is

s(t)=-5t^2+20t+25 for