Question

The brakes of a train produce a retardation of 0.1 m/s. If it's moving at 20m/s how far will it travel before it stops?​

Answer 1

Answer:Acceleration due to friction (retardation) (a) = - μg=−0.9×10=−9m/s  

2

 

Final velocity, v=0m/s

Initial velocity, u=20m/s

Applying formula: v  

2

=u  

2

+2as

Where s is the distance traveled by car before it come to rest.

⇒0  

2

=20  

2

+2(−9)s

⇒18s=400