a balloonist releases a ballest bag from a balloon rising at 40m/s at a time when a balloon is 100m above the ground ,if g=10m/s then the bag reaches to ground in

Answer 1

time of flight: h=vo*t-1/2 g t^2
vo=40
g= 9.8
h=100 solve for time t.
you will need to use the quadratic equation.

Answer 2

S= Ut+1/2at2
-100=40t-5t2
Solving it
t= 10