A red train travelling at 72 km/h and a green train travelling at 144 km/h are headed toward each other along a straight, level track. When they are 950 m apart, each engineer sees the other's train and applies the brakes. The brakes slow each train at the rate of 1.0 m s 2. Is there a collision? If so, answer yes [in the first box] and give the speed of the red train and the speed of the green train at impact, respectively. [in the second and third box - give answers as integers, and in units: m/s but without the units] If not, answer no [in the first box] and give the distance travelled by the red train and the distance travelled by the green train when they stop, respectively. [in the second and third box - give answers as integers in units m but without the unit]

A red train travelling at 72 km/h and a green train travelling at 144 km/h are headed toward each other along a straight, level track. When they are 950 m apart, each engineer sees the other's train and applies the brakes. The brakes slow each train at the rate of 1.0 m s 2. Is there a collision? If so, answer yes [in the first box] and give the speed of the red train and the speed of the green train at impact, respectively. [in the second and third box - give answers as integers, and in units: m/s but without the units] If not, answer no [in the first box] and give the distance travelled by the red train and the distance travelled by the green train when they stop, respectively. [in the second and third box - give answers as integers in units m but without the unit]

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

A red train travelling at 72 km/h and a green train
travelling at 144 km/h are headed toward each other
along a straight, level track. When they are 950 m apart,
each engineer sees the other's train and applies the
brakes. The brakes slow each train at the rate of 1.0 m s
2. Is there a collision?
If so, answer yes [in the first box] and give the speed of
the red train and the speed of the green train at impact,
respectively. [in the second and third box - give answers
as integers, and in units: m/s but without the units]
If not, answer no [in the first box] and give the distance
travelled by the red train and the distance travelled by
the green train when they stop, respectively. [in the
second and third box - give answers as integers in units
m but without the unit]

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