Suppose you defined " positive" motion as motion westward. What would be the person's total velocity?

=force × distance a. work b. velocity c. pressure d. momentum

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Could we see a galaxy that is 20 billion light-years away?