A train makes a round trip on a straight, level track. The first half of the trip is 300km and is traveled at a speed of 75 km/m. After a 0.50 h layover, the train returns the 300km at the speed of 85 km/h. What is the train’s (a) average speed and (b) average velocity?

A train makes a round trip on a straight, level track. The first half of the trip is 300km and is traveled at a speed of 75 km/m. After a 0.50 h layover, the train returns the 300km at the speed of 85 km/h. What is the train’s (a) average speed and (b) average velocity?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter2: Representing Motion

Section: Chapter Questions

Problem 4STP

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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.

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