Final answer:
The speed of the baseball from the perspective of the ground observer is 247.78 m/s.
Step-by-step explanation:
To find the speed of the baseball from the perspective of the ground observer, we need to consider the velocity addition principle. According to this principle, if two velocities are added together, the resulting velocity is the sum of the individual velocities.
In this case, the airplane's speed is given as 820 km/h and the baseball's speed from the woman's perspective is given as 20 m/s. We need to convert the speed of the airplane to m/s to have consistent units.
820 km/h = (820 × 1000) m/ (3600) s = 227.78 m/s.
Now, using the velocity addition principle, we add the speed of the baseball with respect to the airplane (20 m/s) to the speed of the airplane with respect to the ground (227.78 m/s) to find the speed of the baseball with respect to the ground.
20 m/s + 227.78 m/s = 247.78 m/s.
Therefore, the speed of the baseball from the perspective of the ground observer is 247.78 m/s.