Which of the following statements describes a compound machine?
a.
it has movement in only one direction.
b.
it can only be acted on by one force.
c.
it is made up of more than one simple machine.
d.
it makes work more difficult.

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?