An arrangement of source charges produces the electric potential V = 5000z along the r-axis, where V is in volts and z is in meters. Part A What is the maximum speed of a 0.90 g. 7.0 nC charged particle that moves in this potential with turning points at +7.2cm? Express your answer to two significant figures and include the appropriate units.

An arrangement of source charges produces the electric potential V = 5000z along the r-axis, where V is in volts and z is in meters. Part A What is the maximum speed of a 0.90 g. 7.0 nC charged particle that moves in this potential with turning points at +7.2cm? Express your answer to two significant figures and include the appropriate units.