Final answer:
The speed of the baseball after 4.5 seconds of free fall from a skyscraper is 44.1 m/s.
Step-by-step explanation:
The speed of an object in free fall depends on the time it has been falling and the acceleration due to gravity. In this case, the baseball is dropped from a skyscraper, so its initial speed is 0 m/s.
The acceleration due to gravity is approximately 9.8 m/s².
After 4.5 seconds, the speed of the baseball can be calculated using the formula:
v = gt
where v is the final velocity, g is the acceleration due to gravity, and t is the time. Substituting the values, we get:
v = 9.8 m/s² × 4.5 s = 44.1 m/s
Therefore, the speed of the baseball after 4.5 seconds is 44.1 m/s.