Communication is the process of conveying a message to others and it requires six elements. these elements include a source, a channel of communication, a receiver, and the processes of encoding and decoding.

The answer is a message.

Explanation:

A message is considered a unit of communication that is transmitted from one person to another. A message can be delivered through the utilization of some means. It includes courier, telegraphy or electronic bus.

We can communicate verbal or no verbal messages. A verbal message refers to the exchange of information through the use of words. For example,  face-to-face communication or telephone calls. A no verbal message is to communicate something through our actions. For example, when we use body language.  

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