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Up is positive. The ball is thrown straight up. (Velocity is positive, Acceleration is negative)

Up is positive. The ball is dropped straight down. (Velocity is negative, Acceleration is negative)

Down is positive. The ball is thrown straight up. (Velocity is negative, Acceleration is positive)

Down is positive. The ball is dropped straight down (Velocity is positive, Acceleration is positive)

My answers are in parenthesis...but I'm not entirely 100% sure why these answers are what they are. A little clarification would be nice.

Next question pertains to relative motion:

You are in a car traveling south at 50 mph. What is your speed relative to:

A car traveling south at 50 mph? Zero (this one was obvious)

A car traveling south at 25 mph? 25...?

A car traveling north at 50 mph? 0?

A car traveling north at 25 mph? 75...?

A stationary car on the side of the road? I really not sure about this...