Help and please explain will give brainliest

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

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

In the diagram below,abc is congruent to dec what is the value of x