While you are travelling in a car on a straight road at $90 km/h$ , another car passes you in the same direction; its speedometer reads $120 km/h$ . What is your velocity relative to the other driver? (in km/h)

30

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- 30

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210

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- 210

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Solution

The correct option is B $- 30$
Velocity of our car $A, v_{A} = 90 km/h$
Velocity of another car $B, v_{B} = 120 km/h$
Relative velocity of car $A$ w.r.t. car $B$
$v_{A B} = v_{A} - v_{B}$
$\Rightarrow v_{A B} = 90 - 120 = - 30 km/h$

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While you are travelling in a car on a straight road at 90 km/h, another car passes you in the same direction; its speedometer reads 120 km/h. What is your velocity relative to the other driver? (in km/h)

The correct option is B −30Velocity of our car A,vA=90 km/h Velocity of another car B,vB=120 km/h Relative velocity of car A w.r.t. car B vAB=vA−vB ⇒vAB=90−120=−30 km/h

While you are travelling in a car on a straight road at $90 km/h$ , another car passes you in the same direction; its speedometer reads $120 km/h$ . What is your velocity relative to the other driver? (in km/h)

The correct option is B $- 30$
Velocity of our car $A, v_{A} = 90 km/h$
Velocity of another car $B, v_{B} = 120 km/h$
Relative velocity of car $A$ w.r.t. car $B$
$v_{A B} = v_{A} - v_{B}$
$\Rightarrow v_{A B} = 90 - 120 = - 30 km/h$