Aschool bus travels 15 kilometers in 0.75 hours. what is the speed of the school bus?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Rohit is trying to tune an instrument

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.