Got into a discussion today at work with a few co-workers about the physics involved in the below scenario, figured the only way for us to come to a better understanding was to ask someone with more extensive knowledge, so here goes,... A flat bed truck is moving along at 60mph, a person is standing on the bed at the rear of the truck and throws a baseball forward ( the direction the truck is moving ) at 60 mph. how fast is the ball moving? I do understand that forces such as wind resistance factor in. Also that if the speed of the ball is measured from the moving vehicle then its speed is only as fast as its thrown. My question is from a fixed point such as the ground, does the speed of the truck add to the speed of the thrown ball. please explain keeping in mind my physics knowledge is not as extensive as most of yours !