A hiker inspects a tree frog sitting on a small stick in his hand. Suddenly startled, the hiker drops the stick from rest at a height of 1.90 m above the ground and, at the same instant, the frog leaps vertically upward, pushing the stick down so that it hits the ground 0.480 s later. Find the height of the frog at the instant the stick hits the ground if the frog and the stick have masses of 7.45 g and 4.70 g, respectively.