Question Detail

PHY 101 Kinematics in Two Dimensions Objective Question

Question

The relative velocity of car A with respect to car B, V_AB, when both are moving on the ground in the same direction, is given by
Options
A V_AB = V_A + V_B
B V_AB = V_A - V_B
Correct Answer
C V_AB = V_B - V_A
D V_AB = V_A * V_B
Correct Answer

Option B is the correct answer.

Detailed Explanation

The velocity of A relative to B is found by vector subtraction: V_AB = V_A - V_B. This represents the velocity of A as seen by an observer moving with B. If they are moving in the same direction, the magnitudes subtract.

Hint

If both cars are going north, one at 60 km/h and one at 50 km/h, how fast does the faster car appear to be moving away from the slower car?

Question Info