Please explain A 50-kg person is in an elevator. Determine the normal force exerted on the person by the elevator, if the elevator is accelerating downwards at 5 m/s^2.

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.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this