The density of water is 1000 kg/m³. A volume of 1 litre is equal to 0.001 m³. a Calculate the mass

The density of water is 1000 kg/m³. A volume of 1 litre is equal to 0.001 m³.
a Calculate the mass of 1 litre of water.
Ikg
Calculate the work done raising 1 litre of water through a height of 0.8 m. C
The pump lifts 90 litres of water per minute. Calculate the minimum power of the pump.
The pump is switched off. Immediately after the pump is switched off, what is the value of
the water pressure at the bottom of the 0.8 m pipe, due to the water in the pipe?