Water is transported to a village in a tank pulled by a tractor. Fig. 1.1 shows the tank being pulled by a tractor. [Figure 1.1] The combined mass of the tractor and the tank is 4100kg when the tank is empty and 6500kg when the tank is full of water.

1. (a)The density of water is 1000kg/m³. Calculate the volume of water in the tank when it is full. volume =[2]
2. (b)(i)At the start of the journey, the tractor and tank accelerate from rest along a straight, horizontal road. As their speed increases, one form of energy is decreasing. State the name of the form of energy that is decreasing.[1]
3. (b)(ii)Explain what happens to this energy.[2]
4. (c)The village is located on a mountain at a vertical height of 850m above the water supply. The gravitational field strength g is 10N/kg. Calculate the gravitational potential energy gained by the water as it is transported from the supply to the village. energy gained =[2]

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