A skater of mass 55kg begins at rest at the top of a ramp of height 25m. She skates down to the bottom of the ramp at ground level, what is her kinetic energy and velocity at the bottom of the ramp?

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.