Question

a train is moving along a straight section of the track with a velocity of 180km/h . the breaking deceleration is 2 m/s at what distance from a train station should the train driver aply the brake so that train stops at the station
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Answer 1

Answer:

2500m or 2.5km

Explanation:

First convert 180km/hr into m/s

                     180 x 5/18

                    = 50m/s

Now , we know that v = u + at

                               0 = 50 + 2t

                            -50 = 2t

                                t = -50/2 = -25 = 25 seconds

We know that s = ut +  

                      s = (50)(25) + 1/2  

                         = 1250 + 1/2  

                         = 1250 + 1250

                         = 2500m