Question

what type of collision is being described?
inelastic, since the girl moves in the same direction as the thrown ball
inelastic, since the girl moves in the opposite direction of the thrown ball
elastic, since the girl moves in the same direction as the thrown ball
elastic, since the girl moves in the opposite direction of the thrown ball

Explanation:

In an in - elastic collision, objects stick together or move as one after collision. Here, girl's motion related to ball's throw doesn't clearly define stick - together. But, in in - elastic collisions, direction of motion can vary. Opposite motion after interaction is a sign of in - elastic collision.

Answer:

B. inelastic, since the girl moves in the opposite direction of the thrown ball