Meg walks with a velocity of 0.9 m/s west. She does so while riding on a train that is traveling with a velocity of 2.7 m/s east. What is Meg's velocity?
A. 3.6 m/s west
B. 1.8 m/s west
C. 1.8 m/s east
D. 3.6 m/s east

Question

Meg walks with a velocity of 0.9 m/s west. She does so while riding on a train that is traveling with a velocity of 2.7 m/s east. What is Meg's velocity?
 		A.	3.6 m/s west
 		B.	1.8 m/s west
 		C.	1.8 m/s east
 		D.	3.6 m/s east

anonymous · Answer

Velocities are vectors so we can add them! Let's let +x be East and -x be West.

-0.9 + 2.7 = 1.8

Since our answer is positive that means East so the answer is C.