Figure 1 shows a skateboarder descending a ramp Lastehoarder 1.5m 1.0m The skateboarder starts from rest at the top of the ramp at A and leaves at point B horizontally with a velocity v. (a) State the energy changes that take place as the skateboarder moves from A to B. (b) Explain why the acceleration decreases as the skateboarder moves from A to B. (c) In going from A to B the skateboarder's centre of gravity descends a vertical height of 1.5m. Calculate the horizontal velocity, v, stating any assumptions that you make. (d) After leaving the ramp al B the skateboarder lands on the ground at C 0.42 s later. Calculate i. the horizontal distance travelled between B and C. ii. the vertical component of the velocity immediately before impact at C ill. the magnitude of the resultant velocity immediately before impact at C