your answer would be The one in the top right corner that looks a bit like this..
here's the solution,
The <em>radius</em> of the circle =<u> 3 km</u>
distance covered = <em>circumference</em> of the circle,
So, Circumference :
=》

=》

=》

(a). Distance covered by moving object is 18.84 km
(b). 0 km
now, Displacement of the object is 0 km, because displacement is the shortest distance from stating point to the destination, but the object returns back to the starting point, hence magnitude of displacement is 0.
Atomic mass = protons + neutrons
So the total number of protons and neutrons
Ok so 1.23m is 123cm, so now all you do is do 123-6=117
i hope this helped
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