If the passenger is 3.2m above her friend when the camera is tossed, what is the minimum initial speed of the camera, if it is to just reach the passenger? (hint: when the camera is thrown with its minimum speed, its speed on reaching the passenger is the same as the speed of the passenger.)

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).