In the diagram, 91 and q2 are both +5.00*10^-8 C. What is the electric field
at point P? Include a + or - sign to
indicate the direction.

The answer is frictional force

//(b) both involve the use of levers;

It is either a  proton or a neutron im almost positive. hope this .

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared.