Question

An object is blasted upward at an initial velocity, Vo, of 240 ft/s. The height, h(t), of the object is a function of time, t (in seconds), and is given by the formula h(t)=V0T-16t^2 . How long will it take the object to hit the ground after takeoff?
16 seconds
15 seconds
7.5 seconds
4 seconds

Answer 1

h(16)=240(16)-16(16)^2
h(15)=240(15)-16(15)^2
and so on....

Answer 2

im wrong
solve the following for t
240t-16t^2+16=0
240t-16t^2+15=0
240t-16t^2+7.5=0
240t-16t^2+4=0

Answer 3

so what do i do with those numbers?

Answer 4

use the quadratic formula or try to factor

Answer 5

im confused

Answer 6

for example:
240t-16t^2+16=0
-16t^2+240t+16=0
t^2-15t-1=0
a=1
b=-15
c=-1
t=[15-sqrt{15^2-4(1)(-1)}]/(2)