Which law of motion accounts for the following statement?

"the gravity of the sun causes the planets to move in a circular path."

First, you need forces attracting the Sun and Earth toward each other.  That's described by Newton's law of universal gravitation.

Then you need the description of how that force causes the planet to move in a circular path.  The best choice is Newton's Second law of motion: F = m A .

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

where's the following? you gotta add it to know what the choices are

explanation: