A rocket is launched from ground level with an initial vertical velocity (
v0
) of 176 ft/s. After how many seconds will the rocket hit the ground? (Hint:
h(t)=−16t2+v0t+h0

Question

A rocket is launched from ground level with an initial vertical velocity (
v0
) of 176 ft/s. After how many seconds will the rocket hit the ground? (Hint: 
h(t)=−16t2+v0t+h0

alyssajobug · Answer

@nikato , do you know how to do this?

nikato · Answer

can u rewrite that equation thing after the hint?

alyssajobug · Answer

After hint it is just saying that it blank ______ is in s for seconds

alyssajobug · Answer

@nikato

nikato · Answer

no, that equation. its looks weird with the 0s. i would like u to rewrite it for me

alyssajobug · Answer

in the lesson, the 0 is like towards the bottom half of the v

alyssajobug · Answer

not sure how to indicate that

nikato · Answer

$$h(t)=-16t ^{2}+v _{o}t+h _{0}$$

nikato · Answer

liek this?

alyssajobug · Answer

ya

alyssajobug · Answer

@nikato

alyssajobug · Answer

Just like that

alyssajobug · Answer

A rocket is launched from ground level with an initial vertical velocity ($$v _{0}$$) of 176 ft/s. After how many seconds will the rocket hit the ground? (Hint: $$h(t) = -16t ^{2} + v _{0} t + h _{0}$$

nikato · Answer

i think u just substitute the velocity and get this

0=-16t^2 +176t
and solve for t either by factoring or quadratic equation

alyssajobug · Answer

ok, quadratic equasion as in $$x=-b \pm \frac{ \sqrt{b ^{2}}-4ac }{ 2a }$$

alyssajobug · Answer

how would you factor that?

alyssajobug · Answer

@nikato

nikato · Answer

sorry about that. factor becuz both go into 16 so

0=-16t(t-11)

and u can solve for t

nikato · Answer

@alyssajobug

alyssajobug · Answer

OK! thanks sooooo much!!! I think I got it from here!!!  @nikato

nikato · Answer

yea. no problem. sorry it took me a while to reply. was eating dinner

alyssajobug · Answer

NO PROBLEM! THX!!!