Question 678387
I'm assuming your units are in feet.


It will reach the peak at 10/2 = 5 seconds.


The zeros are {{{x=0}}} and {{{x=10}}}


{{{x=0}}} or {{{x=10}}}


{{{x=0}}} or {{{x-10=0}}}


{{{k*x(x-10)=0}}}


{{{k*x^2-10kx=0}}}


So the function is {{{y = kx^2-10kx}}}


Compare this to {{{y = -16x^2+v*x}}} and you'll see that k = -16, which means -10k = 160


So the function is {{{y = -16x^2+160x}}}


Plug in {{{x=5}}}


{{{y = -16x^2+160x}}}


{{{y = -16(5)^2+160(5)}}}


{{{y = 400}}}


So it will fly to a max height of 400 ft.