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

question 86

Multiple Choice

Mort, who is standing on the ground, throws a ball at 20 m/s eastward 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) 70 m/s westward
• B) 90 m/s westward
• C) 50 m/s eastward
• D) 50 m/s westward
• E) 90 m/s eastward

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