Question

a driver of a train moving at a constant speed of 25 metre per second is a goods train in the same track of 500 moving at a speed of 5 metre per second in the same direction what is the minimum retardation applying brake should he gives his trying to avoid collision

Answer 1

The relative speed between the two trains is :

30 - 10 = 20m/s

This is the initial relative speed.

When brakes are applied the train slows down.

Given the acceleration = 4 m/s²

u = 20 m/s

With time the train comes to a sudden stop making the velocity 0.

V² = U² - 2as

0 = 400 - 8s

400 = 8s

S = 400/8

S = 50m