I need help with this answer (pick a model)

The speed of a falling object increases at a constant rate as time increases since the object was dropped. which graph could represent the relationship betweent time in seconds, and s, speed in meters per second? speed of a falling object object over time

If a || b and e || f , what if the value of y ?

Find the value of x. give reasons to justify your solutions! l, m ∈ kn