Question

The two parallel tracks of the railway run from north to south. Train A travels north at 54 kmh and train B travels south at 90 kmh. A monkey runs on the roof of train A in the opposite direction to its speed. The speed felt by the person sitting in train B?

Answer 1

Answer:

144 km/h =  40 m/s

Explanation:

Relative velocity $v_{AB} = v_{A} - v_{B}$

⇒ $v_{AB}$ = (54) - (-90)                        ∵ train B is moving in opposite direction

⇒$v_{AB}$ = 54+90

⇒$v_{AB}$ = 144 km/h

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