i need help with this

1) A 75 kg snowboarder slides up a frictionless rail to a height of 1.75 m high and slides across it at 2.50 m/s. How much kinetic energy did he have before sliding up the rail? 2) A 66 kg skateboarder jumps The Great Wall of China, clearly. At the peak of his jump he is 18 m high and travelling at 12 m/s. Assuming he started at rest, nd his initial height