PLSSS HELP A 2-kg cart starting from rest rolls down a hill and at the bottom has a speed of 5 m/s . If the cart were given an initial push, so its initial speed at the top of the hill was 2 m/s , what would be its final velocity at the bottom?

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.