An automobile traveling 95 km/h overtakes a 1.30-km-long train traveling in the same direction on a track parallel to the road. if the train's speed is 75 km/h, how long does it take the car to pass it, and how far will the car have traveled in this time? see fig. 2–36. what are the results if the car and train are traveling in opposite directions?

Same direction: t=234s; d=6.175Km

Opposite direction: t=27.53s; d=0.73Km

Explanation:

If the automobile and the train are traveling in the same direction, then the automobile speed relative to the train will be (the train must see the car advancing at a lower speed), where is the speed of the automobile and the speed of the train.

So we have .

So the train (anyone in fact) will watch the automobile trying to cover the lenght of the train L at that relative speed. The time required to do this will be:

And in that time the car would have traveled (relative to the ground):

If they are traveling in opposite directions, we have to do all the same but using (the train must see the car advancing at a faster speed), so repeating the process:

newton's first law of motion

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.