Mort, who is standing on the ground, throws a ball at 20 m/s westward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?
A) 50 m/s westward
B) 50 m/s eastward
C) 90 m/s westward
D) 70 m/s westward
E) 90 m/s eastward

Question

Quizplus · Accepted Answer

The Answer of Mort, who is standing on the ground, throws a ball at 20 m/s westward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?
A) 50 m/s westward
B) 50 m/s eastward
C) 90 m/s westward
D) 70 m/s westward
E) 90 m/s eastward

Mort, Who Is Standing on the Ground, Throws a Ball