SOLUTION: A toy airplane flies according to the formula d(t)=5+20t-t^2 where d(t) is in meters and t is in seconds. How long will the toy airplane take to reach a distance of 100 meters from

Question 1053466: A toy airplane flies according to the formula d(t)=5+20t-t^2 where d(t) is in meters and t is in seconds. How long will the toy airplane take to reach a distance of 100 meters from the person who controls it?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

given:

-------------------------

and also:

After 7.764 sec and 12.236 sec the toy plane is 100 m
from the controler
--------------------
Heres the plot:

Note that the peak is at and m
--------------
The times I came up with should be below and above
by the same amount

and

OK
RELATED QUESTIONS
A paper airplane follows a parabolic path with h=-1/4t^2+t+3, where h is height in... (answered by nerdybill)

An object is moving in a straight line. It initially travels at a speed of 9 meters per... (answered by Alan3354)

If the distance covered by an object in time t is given by s(t)=t^2+5t, where s(t) is in... (answered by mananth)

If the distance covered by an object in time t is given by s(t)=2t^2+3, where s(t) is in... (answered by MathLover1)

An object is moving in a straight line. It initially travels at a speed of 6 meters per... (answered by Alan3354)

A ball is thrown upwards. Its height is described by the equation h=-5t^2+20t where h is... (answered by josgarithmetic)

H= -5t^2+20t models the height of a ball that is kicked into the air, where H is the... (answered by htmentor)

H= -5t^2+20t models the height of a ball that is kicked into the air, where H is the... (answered by MathLover1)