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← IIT-JEE 2008 · Paper 2
PhysicsAssertion and reason+3 / -1Question 32 of 66

IIT-JEE 2008 · Paper 2, Physics question 32

STATEMENT-1: For an observer looking out through the window of a fast moving train, the nearby objects appear to move in the opposite direction to the train, while the distant objects appear to be stationary.

and

STATEMENT-2: If the observer and the object are moving at velocities V⃗1\vec V_1 and V⃗2\vec V_2 respectively with reference to a laboratory frame, the velocity of the object with respect to the observer is V⃗2−V⃗1\vec V_2-\vec V_1.

Choose one option
Answer and worked solution

Official answer: B

Statement 1. Nearby objects sweep across the field of view quickly (large angular speed) in the direction opposite to the train; distant objects change direction so slowly that they appear stationary. True.

Statement 2. The relative velocity is V⃗2−V⃗1\vec V_2-\vec V_1. True. But relative velocity is the same for near and far objects; the difference in Statement 1 comes from the angular speed v/rv/r, so Statement 2 does not explain it.

(B)