The figure shows a block on a horizontal surface with the velocity v v
and acceleration a
a
vectors shown. Which of the following best describes the motion of the box at the moment shown?

Abearing is designed to a reduce friction b. support a load c.guide moving parts such as wheels, shafts and pivots d. all of the above

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.