Question

you are riding on a bus and tossing a ball straight up and down inside the bus. what does the balls motion look like from the frame of reference of a person on a sidewalk beside the street as the bus goes by?

Explanation:

The bus is moving forward, so the ball has the bus's horizontal velocity. When tossed up, it moves vertically (up/down) and horizontally (with the bus's speed). From the sidewalk, this combines to a parabolic (curved) path, matching option a. Option b is horizontal, which doesn't account for vertical motion.

Answer:

a