A 206kg rock sits in full sunlight on the edge of a cliff 5m high. The temperature of the rock is 30.2 degrees celcius. If the rock falls from the cliff into a pool containing 6m^3 of water at a temperature of 15.5 degrees celcius, what is the final temperature of the rock-water system? Assume that the specific heat of the rock is 1010J/(kg*K).