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(D) Let the observer move with velocity $v$ along the line joining two stationary objects $A$ and $B$. Since the objects are stationary in the ground

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(D) Let the observer move with velocity $v$ along the line joining two stationary objects $A$ and $B$. Since the objects are stationary in the ground frame,their velocities are $v_A = 0$ and $v_B = 0$. The velocity of the objects relative to the observer is given by $v_{	ext{rel}} = v_{	ext{object}} - v_{	ext{observer}}$. For both objects,$v_{	ext{rel}} = 0 - v = -v$. This means both objects appear to move with the same speed $v$ in the direction opposite to the observer's motion. Since both have the same velocity vector ($-v$ relative to the observer),all the given statements are correct.

An observer moves with a constant speed along the line joining two stationary objects. He will observe that the two objects

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