A runaway train car that has a mass of 15,000 kg travels at a speed of 5.4 m/s down a track. Compute the time required for a force of 1500 N to bring the car to rest.

Solution 5PE

Step 1 of 4</p>

Train car of mass travelling at a speed of on a track. Here we need to calculate the time required to bring the train car to rest by applying a force of .

Using newton's second law, we can calculate the time required to stop the train car.

Step 2 of 4</p>

Let and be the initial and final velocity of the train. Since the train comes to rest finally, the final velocity of the train is zero. The Applied force will be negative because it is applied in the opposite direction to the motion of the train, to bring the train car to rest.

Given data,

Initial velocity,

Final velocity,

Force applied,

Mass of train car,

To find,

Time taken to stop the car,