Question

class 11 physics chapter 3 example number 3.9 solution..
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Answer 1

Answer:

Two towns A and B are connected by regular bus service with a bus leaving in either direction every T minute. A man cycling with a speed of 20 km h-1 in the direction A to B notices that a bus goes past him every 18 min in the direction of his motion, and every 6 min in the opposite direction. What is the period T of the bus service and with what speed (assumed constant) do the buses ply on the road?

Answer: Let vb be the speed of each bus. Let vc be the speed of cyclist.

Relative velocity of the buses plying in the direction of motion of cyclist is vb – vc .

The buses playing in the direction of motion of the cyclist go past him after every

18 minute i.e.18/20 h.