Question

A driver of train A moving at a speed 30m/s sees another train B going on the same track and

in the same direction with speed 10m/s. he immediately applies brakes that gives his train a

constant retardation of 2m/s2

. What must be the minimum distance between the trains in

order to avert a collision?​ (11th science physics)

Answer 1

Answer:

200 m

Explanation:

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 = 2 m/s²

u = 20 m/s

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

V² = U² - 2as

0 = 400 - 4s

400 = 4s

S = 100m