Dr. petrovic's goal is to his clients channel their motivation for positive growth and to realize their potential. he is most likely a therapist.

Dr. Petrovic is most likely a positive therapist, since his goal is to help his clients channel their motivation for positive growth and to realize their potential, he's most likely an adept of Positive Psychology. The field is structured on the belief that people want to lead meaningful and fulfilling lives, to cultivate what is best within themselves, and to enhance their experience of love, work and play.

we can solve this via the kinematic equation:

where the vertical velocity is zero and so:

since the height of the building is 29.3 meters then:

the ball was in motion for approximately 2.45 seconds