According to http://www.topendsports.com/testing/tests/yo-yo-intermittent.htm: "There are two test levels: the Yo-Yo Intermittent Recovery level 1 (Yo-Yo IR1) test (designed for lesser trained individuals) starts at 10 km/hr and the Yo-Yo Intermittent Recovery level 2 (Yo-Yo IR2) test (aimed at well trained and elite athletes) starts at 13 km/hr, with both levels increasing in speed throughout the test."
Yo-yo and yogurt are objects. They begin with the letters yo.
· Yo-Yo
Yo Yo's
A
yo-yo ma
· yo-yo
yo-yo
Yo-yo yarn yak
Fraternity Test
No
Yes, a yo-yo uses motion energy when it is first pulled down. As it moves against gravity to the bottom of the string, it gains kinetic energy which is converted from the potential energy stored when the yo-yo was at rest.
yo face! yo face!