Question

Two objects A and B are moving with velocities of 5 m/s and 11 m/s towards each other. What is the magnitude of relative velocity of object A with respect to B?

• A. 6 m/s
• B. 7 m/s
• C. 16 m/s
• D. 11 m/s

Answer 1

The correct option is C 16 m/s

Velocity of object A, $v_A=5m/s$
Velocity of object B, $v_B=–11m/s$ (Negative sign indicates that the direction is opposite to that of A)

Relative velocity of object A with respect to B:
$v_{AB}=v_A–v_B$
$\Rightarrow v_{AB}=5–(–11)=16m/s$
Hence, the correct answer is option (c).