A filmmaker wants to achieve an interesting visual effect with filming a scene during a converging lens with a focal lens of 51.0m. The lens is placed among the camera and a horse, which canters toward the camera at a constant speed of 7.5m/s. The camera starts rolling when the horse is 37.0m from the lens. Discover the average speed of the image of the horse (a) through the 1st 2.0s after the camera starts rolling and (b) during the following 2.0s.