Chapter 6 of 2363 min read

Relative velocity in one dimension

Why this is asked: Relative velocity is a subtraction, v_AB = v_A − v_B, so assigned sign matters as much as speed — two objects add their speeds only when opposite directions are already opposite in sign.

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Test yourself

•Two cities X and Y are connected by a regular bus service with a bus leaving in either direction every $T$ min. A girl driving a scooty at a speed of 60 km/h in the direction X to Y notices that a bus goes past her every 30 minutes in the direction of her motion, and every 10 minutes in the opposite direction. Choose the correct option for the period $T$ of the bus service and the speed (assumed constant) of the buses.

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