An object is launched upward
from 62.5 meters above ground level with an
initial velocity of 12 meters per second. the
gravitational pull of the earth is about 4.9
meters per second squared. how long will the
object take to hit the ground?

Check the picture below.  The picture is using feet, but is pretty much the same trajectory for meters.

so the object hits the ground when y = 0, thus

we can't use -2.55, since it's seconds and can't be negative, so t = 5 seconds later.

yes

step-by-step explanation:

this is answer of 144 cubic meters