A. 30 kmh−¹
B. 130 kmh−¹
C. 200 kmh−¹
D. 230 kmh−¹
Correct Answer:
Option A – 30 kmh−¹
Explanation
Since the cars are moving in the same direction, the velocity of a body A, Va, relative to another body B, Vb is given by V = Va – Vb
∴ the velocity of faster car is measured by the observer in the slower car is V = 130kmh¯¹ – 100 kmh¯¹ = 30 kmh−¹