The height in meters of a projectile can be modeled by h = −4.9t2 + vt + s where t is the time (in seconds) the object has been in the air, v is the initial velocity (in meters per seconds) and s is the initial height (in meters). A soccer ball is kicked upward from the ground and flies through the air with an initial vertical velocity of 4.9 meters per second. After how many seconds does it land approximately?

Question

anonymous · Answer

$$-4.9t^2+4.9t=0$$ solve for $t$

anonymous · Answer

factor as 
$$4.9t(t-1)=0$$ then it is pretty clear what $t$ has to be right?

anonymous · Answer

if not, let me know

anonymous · Answer

ya, sorry, i'm still confused.....

anonymous · Answer

if $t-1=0$ then $t=1$

anonymous · Answer

what might be confusing is what $v$ is
in this example $v=4.9$

anonymous · Answer

yeah, that was throwing me off, thank you

anonymous · Answer

i thought it might be
yw