Question

If an object is dropped from a height of 144 feet, the function h(t)=16t^2+144 gives the height of the object after t seconds. When will the object hit the ground?
A. 9 s
B. 6 s
C. 1.5 s
D. 3 s

Answer 1

(B)

Answer 2

presumably it is \(h(t)=-16t^2+144\)
set \(-16t^2+144=0\) solve in 3 steps

Answer 3

\[16t^2=144\] divide by 16, take the square root

Answer 4

9

Answer 5

hold on

Answer 6

\[144\div 16=9\] so you have \(t^2=9\) but you want \(t\) not \(t^2\)
what number squared is 9 ?

Answer 7

3

Answer 8

you win

Answer 9

(D)

Answer 10

thanks

Answer 11

yw