Answer:
33.5 m
Explanation:
Ignore air resistance and assume g = 9.8 m/s²
Falling down, it follows the reverse path.
From the ape x, it dropped ½(9.8)1.0² = 4.9 m to the top of the tower.
From the ape x, it dropped ½(9.8)(1.0 + 1.8)² = 38.4 m to the ground.
The tower is 38.4 - 4.9 = 33.5 m tall.
