A truck moving east at 20 m/s passes a car moving east at 12 m/s. What is the velocity of the truck as seen from the car's reference frame?
A32 m/s east
B8 m/s east
C8 m/s west
D20 m/s east
Explanation
📌 Relative velocity = truck velocity − car velocity = 20 − 12 = 8 m/s east. Distractor A adds instead of subtracting; C reverses direction; D ignores the car's frame entirely.