A reversible change is a change that can be undone or reversed
Answer:
In my opinion I think the answer is C you don't have to choose C
I think it’s the third one idk tho
The runner has initial velocity vector

and acceleration vector

so that her velocity at time
is

She runs directly east when the vertical component of
is 0:

It's not clear what you're supposed to find at this particular time... possibly her position vector? In that case, assuming she starts at the origin, her position at time
would be

so that after 10.4 s, her position would be

which is 19.9 m away from her starting position.