An object dropped from a balloon descending at 4.2 m/s lands on the ground 10 s later. What was the altitude of the balloon at the time when the object was dropped?

Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.