Final answer:
The displacement of a baseball thrown up from 100 meters and reaching a peak 50 meters above its starting point is a 150-meter ascent from the ground.
Step-by-step explanation:
The displacement of a baseball thrown straight up from a height of 100 meters, reaching a maximum height of 50 meters above the throwing point, can be calculated by considering the initial and final positions of the baseball. Since the ball was thrown from 100 meters above the ground and reached 50 meters above that point, the maximum height attained by the ball from the ground would be 150 meters.
Therefore, the displacement, which is the straight-line distance from the starting point to the final point, would also be 150 meters. This is so because displacement is a vector quantity, and it only takes into consideration the initial and final points, irrespective of the path taken.