Answer: The height of the building is 69.6 m
Step-by-step explanation:
To calculate the height of the building, we use second equation of motion:

where,
s = height of the building = ?
u = initial velocity of the ball = 25 m/s
a = acceleration due to gravity =

t = time taken = 2.0 sec
Putting values in above equation, we get:

Hence, the height of the building is 69.6 m