If it weren't for the downward pull of gravity it would go on forever at the velocity that it left your hand. A horse gallops 15 km in 30min. 30km per hour. There are other possible equivalent answers using different units. Distinguish between speed and velocity.
Speed is the magnitude of the vector quantity velocity.
Give an example to support your answer. No, because the car may be turning. A car going a steady 50 miles per hour around a race track would be an example. Distinguish between velocity and acceleration. Velocity is speed and direction.