Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is
A)5 m/s.
B)11 m/s.
C)either depending on her running direction
D)none of the above

Question

Quizplus · Accepted Answer

Katelyn's speed relative to an observer on the ground depends on her running direction. If she runs in the same direction as the train, her speed relative to the ground is 11 m/s (8 m/s + 3 m/s). If she runs in the opposite direction, her speed relative to the ground is 5 m/s (8 m/s - 3 m/s).

Katelyn Runs Along the Aisle of a Train That Moves