10. A skier accelerates at a rate of 4.6m/s? for 4.5s. What is his initial speed if his final speed is 21m/s?

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

What is friction? how does it affect the motion of an object?