I have a teacher who is lacking in the explanation department, so I figured I could find an answer here. We are doing relativity in class, and I have a quick question on it. The problem is, "A passenger in a convertible throws a ball up into the air. the car is going 35 m/s. The upward velocity of the ball is 8 m/s. Give the equations that specify the ball position with regards to: the passenger (prime coordinates) and an observer on the road (unprime coordinates)." In the above problem, we are supposed to find x, y, z, x prime, y prime, and z prime. Our teacher told us that y and y prime are the same value, which I found. However, I cannot find x, x prime, z, or z prime. Any hints would be very helpful to me. The teacher said the following: x=x'+vt and x'=x-vt. However, I do not have the time, so I can't use those equations. Please help ASAP.