500 litre of water is raised from the floor of a house at height 4 m to its third floor a height 12 m.State whether the potential energy of water will decrease or increase. Find the decrease/increase in potential energy of water.Take ,g=10 Ng^(-1) ,density of water =1kg "litre"^(-1)

500 litre of water is raised from the floor of a house at height 4 m t

1.	500 litre of water is raised from the floor of a house at height 4 m to its third floor a height 12 m.State whether the potential energy of water will decrease or increase. Find the decrease/increase in potential energy of water.Take ,g=10 Ng^(-1) ,density of water =1kg "litre"^(-1)
Answer» Solution :GIVEN ,MASS of WATER m=volume `xx` density =500 LITRE `xx` 1 kg `litre^(-1)` =500 kg `h_(1)=4m,h_(2)`=12m,g=10 N `kg^(-1)` Since height of water above the ground increase `(h_(2) GT h_(1))` , so the potential energy of water increases. Increases in potential energy =mg `(h_(2)-h_(1))` `4xx10^(4)` J