a wooden trolley of mass 20 kg accelerates at 2 m/s-{2}, if force due to engine is 50 N, friction force is equal to?​

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.

i think the answer is a and b

i wish you luck

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