Dr. Hoax submitted a study to show that getting vaccines cau…

Dr. Hoax submitted a study to show that getting vaccines causes autism. Peer reviewers critiqued the methods and accepted the study for publication in a scientific journal. Hundreds of other researchers conducted similar studies in their labs and Dr. Hoax’s results did not match their own. Thus, the results of Dr. Hoax’s were no longer accepted as truth. Which characteristic of the scientific method helped scientists reject the results of Dr. Hoax’s study? 

A 60 kg snowboarder (including equipment) heads down a very…

A 60 kg snowboarder (including equipment) heads down a very slippery slope starting at a height of 100 m, from rest, above the flat surface at the bottom.  Use the Law of Conservation of Energy to determine the speed she could attain by the time she hits the flat (at the bottom of the hill)?