Question
a toy rocket is launched from a platform that is 48 feet high. the rockets height above the ground is modeled by h=-16t^2+32t+43. find the maximum height of the rocket
find the time it will take for the rocket to reach the ground.
find the time it will take for the rocket to reach the ground.
Answers
Reiny
If it is lauched from a height of 48 ft, then the equation should be
h = -16t^2+32t+48
I will assume a typo
you want h = 0 (at ground level h=0)
0 = -16t^2+32t+48
t^2-2t-3 = 0
It factors,
(t-3)(t+1) = 0
t = 3 or t = -1, rejecting the negative time
it took 3 seconds
h = -16t^2+32t+48
I will assume a typo
you want h = 0 (at ground level h=0)
0 = -16t^2+32t+48
t^2-2t-3 = 0
It factors,
(t-3)(t+1) = 0
t = 3 or t = -1, rejecting the negative time
it took 3 seconds