The location at which the marble have maximum kinetic energy is location Y.
What is conservation of energy?
Conservation of energy states that total energy of the system doen not change else the one form of energy is converted into another form within the system.
In the given diagram it is mention that potential energy of marble is highest at the location W as potential energy is directly proportional to the height. But when the marble rolls down it attains the kinetic energy and potential energy decreases.
According to the law of conservation at point Y potential energy is minimum, so that kinetic energy becomes maximum at this point.
Hence at location Y marble have maximum kinetic energy.
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