Little Joey (m = 30 kg) is at the top of a waterslide, ready to jump on. The section of the slide between points A and B is essentially frictionless...

Little Joey (m = 30 kg) is at the top of a waterslide, ready to jump on. The section of theslide between points A and B is essentially frictionlessa. Little Joey sits down and begins to slide. How fast is he going at point B?.