Physics

Problem

A student raises a

2.0\,\text{kg}

textbook from the floor to a shelf

1.5\,\text{m}

above the floor in two different ways: • Method I – straight upward. • Method II – first sliding the book

3.0\,\text{m}

horizontally across a table, then lifting it vertically

1.5\,\text{m}

. Neglect all friction. Compare the work done by gravity in Method II to that in Method I and justify your answer in one or two sentences.