If pes represents the potential energy stored in a spring at kg times m/s sqaured, and x represents the change in spring length from its equilbrium position in m, what is the unit for the spring constant k in the formula pes=1/2kx squared?

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above