A balloon ascends with a uniform velocity of 3 m/s from the ground. At the end of 20 seconds, a particle is released from it. Find the time the particle takes to reach the ground.

Answer 1

a free-fall equation ... h = 1/2 g t^2 + v0 t + h0

0 = -4.9 t^2 + 3 t + 60

use the quadratic formula to find t