Question

The total mass of the train and its passengers is 750000kg. The train is traveling at a speed of 84m/s. The driver applies the brakes and the train takes 80s to slow down to a speed of 42m/s.

Answer 1

|F| = 393750 N

Step-by-step explanation:

Given that,

Total mass of the train, m = 750000 kg

Initial speed, u = 84 m/s

Final speed, v = 42 m/s

Time, t = 80 s

We need to find the net force acting on the train. The formula for force is given by :

F = ma

`F=(m(v-u))/(t)\\\\F=(750000* (42-84))/(80)\\\\F=-393750\ N`

So, the magnitude of net force is 393750 N.