At the time t = 0, the child throws a coconut upward (suppose the coconut is directly below the monkey) at a speed v0. At the same instant, the monkey releases his grip, falling downward to catch the coconut. Suppose the initial speed of the monkey is zero, and the cliff is high enough thus that the monkey is able to catch the coconut before hitting the ground. Find the time taken for the monkey to reach the coconut?