Which expression gives the velocity of object A relative to object B

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Which expression gives the velocity of object A relative to object B, denoted

v_{A/B}

, if

v_A

and

v_B

are the respective velocities of A and B measured along the same straight line with respect to an inertial ground frame? (a)

v_{A/B}=v_A-v_B

(b)

v_{A/B}=v_B-v_A

(c)

v_{A/B}=v_A+v_B

(d)

v_{A/B}=\dfrac{v_A+v_B}{2}