Please answer both answers

Q3/ An object of mass 500 kg, initially having a velocity of 100 m/s, decelerates to a final velocity of 20 m/s at height of 15 m. What is the change in kinetic and potential energy of the object, in kJ? Assume g = 9.81 m/s? Q4/ A house has outside walls made of brick with a thermal conductivity of (1.20 W/m. K). The wall thickness is (0.20 m). If the inside temperature of the wall is (20 C) and the outside temperature of the wall is (-10 C), determine the heat transfer rate per unit area from conduction (the conductive heat flux) for the wall. A Arca, A