What force is necessary to accelerate a 50kg box at 30 m/s2?

F = m X a

Therefore ,

Force required = 50 X 30 = 1500 newton

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.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete