Question

Sally rides her bike 100 m to the East, then turns around and rides 150 m West, then turns again and rides 20 m back to the East. What is Sally's displacement from her original position?

Answer 1

Sally's displacement from her original position is -30 m to the West.

Step-by-step explanation:

To find Sally's displacement from her original position, we need to calculate the net distance she has moved in the east-west direction. Let's break down her movement:

1. Sally rides 100 m to the East (+100 m)
2. Sally turns around and rides 150 m to the West (-150 m)
3. Sally turns again and rides 20 m back to the East (+20 m)

To find the net distance, we add all the distances together: +100 m - 150 m + 20 m = -30 m.

Therefore, Sally's displacement from her original position is -30 m to the West.