If an object falls twice as far, how do you think the energy acquired changes? halves
doesn't change
doubles
quadruples

Doubles

Explanation:

Before starting to fall, the object will have energy in the form of potential energy. This will be the energy that will be transformed into kinetic energy, once the object starts its fall. And the potential energy that the object had before starting to fall, will be equal to the kinetic energy acquired during the fall. The potential energy is given by:

Where m is the mass of the object, g is the gravity, and h is the distance to the floor. As you can see, The potential energy is proportional to the height of the fall, so if this height doubles, the potential energy and therefore, the kinetic energy acquired will doubles.

Method:-Water dissolution, filtration, and evaporation:

Sodium chloride is easily soluble in water, while sand does not dissolve in water. To separate out sodium chloride from sand, one can dissolve the mixture of sodium chloride and sand in water. Heating and stirring will speed up the process of sodium chloride dissolution in water. The sand will settle down at the bottom of the container and can be filtered out from the liquid phase, using a filter paper, piece of cloth, etc. Finally, the sodium chloride can be obtained by evaporating the water from the liquid phase (water containing sodium chloride in it) by boiling it at 100 degrees Celsius. 

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