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A bus moves east at $40$ km/h and a car east at $60$ km/h. Velocity of car relative to bus is:
A$100$ km/h east, since the two add directly
B$60$ km/h east, equal to the car's ground speed
C$20$ km/h west, since the bus appears to retreat
D$20$ km/h east, since the car overtakes at the difference
Answer & Solution
Correct answer: D. $20$ km/h east, since the car overtakes at the difference
$v_{cb} = v_c - v_b = 60 - 40 = 20$ km/h east.
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