How do i find the resultant acceleration

Let denote the North-facing force, and the South-facing force. Let's also take North-facing vectors as having positive direction.

The resultant force on the body is

Then we have

where is the resultant acceleraton vector. So

It looks like you assumed gravity was involved here, but that doesn't seem to be the case, at least not to me. We're given two forces, and only these two forces as far as I can tell, so you shouldn't assume there are any others acting on the body.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

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

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