A second hiker follows the same path the fi rst day, but then walks 15.0 km east on the second day before turning and reaching the rangers tower. Is the second hikers resultant displacement vector the same as the fi rst hikers, or different?
Physics (from Ancient Greek: φυσική (ἐπιστήμη) phusikḗ (epistḗmē) "knowledge of nature", from φύσις phúsis "nature) is the natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force. More broadly, it is one of the mainanalyses of nature, conducted in order to understand how the universe behaves. Physics is one of the oldest academic disciplines, perhaps the oldest through its inclusion of astronomy. Over the last two millennia, physics was a part of natural philosophy along with chemistry, certain branches of mathematics, and biology, but during the scientific revolution in the 17th century, the natural sciences emerged as unique research programs in their own right. Physics intersects with man