physics
posted by Anonymous .
A hot air balloon is traveling vertically upward at a constant speed of 3.9 m/s. When
it is 10 m above the ground, a package is
released from the balloon.
After it is released, for how long is the
package in the air? The acceleration of gravity
is 9.8 m/s
2
.
Answer in units of

Y = 10 + 3.9 t  (g/2) t^2 = 0
Subsitute in the g value and solve the equation. Take the positive root. (There will also be a negatve solution)