doc based on this lab: https://phet. colorado. edu/sims/html/wave-on-a-string/late st/wave-on-a-string_en. html

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 don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation:

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

not too sure thinking all accelerations are pointed down