Question

A hot air balloon is ascending with a constant velocity of 5m^s-1 when somebody in the balloon throws a bottle upward with a velocity of 2m^s-1 if the balloon is 55m above tge ground when this happens calculate the time taken for the bottle to reach the ground

Answer 1

h = -1/2 g t^2 + 7 t + 55

h is zero when the bottle hits the ground

0 = -4.9 t^2 + 7 t + 55

you want the positive solution

Answer 2

Yes