Question

A train is moving with a speed of 90 km/h. On applying brakes a retardation of 1.25
m/s² in caused . At what distance the driver should applying brakes to stop the train at the station. ​

Answer 1

Answer:

please refer the attachment.

Explanation:

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Answer 2

Given :-

☄ Initial velocity of the train, u = 90 km/h = 25 m/s

☄ Final velocity of the train, v = 0 m/s

☄ Retardation of the train, a = -1.25 m/s²

To find :-

Distance the driver should applying brakes to stop the train at the station.

Solution :-

By using equation of motion .i.e.,

➠ v² = u² + 2as

here,

v = Final velocity, u = Initial velocity, a = Acceleration and s = Distance

➠ (0)² = (25)² + (2)(-1.25)(s)

➠ 0 = 625 + (-2.5)s

➠ - 625 = -2.5s

➠ s = 625/2.5

➠ s = 250 m.

thus,the distance the driver should applying brakes to stop the train at the station is 250m.

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